Coccometra AH Clark, 1908 (original description)
Coccometra hagenii (Pourtalès, 1868) (source of synonymy)
Coccometra nigrolineata AH Clark, 1918 (original description)
Comasteracea AH Clark, 1908 accepted as Comatuloidea Fleming, 1828 (original description)
Comasteridae AH Clark, 1908 accepted as Comatulidae Fleming, 1828 (original description)
Comasterini AH Clark, 1908 (original description)
Hathrometra AH Clark, 1908 (original description)
Hathrometra sarsii (Düben & Koren, 1846) accepted as Hathrometra tenella (Retzius, 1783) (new combination reference)
Hathrometra tenella (Retzius, 1783) (new combination reference)
Himerometroidea AH Clark, 1908 (original description)
Isometra AH Clark, 1908 (original description)
Leptometra AH Clark, 1908 (original description)
Leptometra celtica (M'Andrew & Barrett, 1857) (new combination reference)
Leptometra phalangium (Müller, 1841) (new combination reference)
Pentametrocrinidae AH Clark, 1908 (original description)
Pentametrocrinus AH Clark, 1908 (original description)
Pentametrocrinus atlanticus (Perrier, 1883) (source of synonymy)
Pentametrocrinus tuberculatus (AH Clark, 1907) (source of synonymy)
Pentametrocrinus varians (Carpenter, 1882) (source of synonymy)
Thalassometridae AH Clark, 1908 (original description)
Thaumatometra AH Clark, 1908 (original description)
Thaumatometra abyssorum (Carpenter, 1888) (new combination reference)
Thaumatometra alternata (Carpenter, 1888) (new combination reference)