GORGONOCEPHALIDAE 239 



the female. Astrochlamys bruneus is the first Ophiurid known to carry the male on the 

 back, as it is also the first viviparous Gorgonocephalid made known. 



The largest specimen at hand measures 20 mm. in diameter of disk, the arms being 

 CO. 100 mm. long. I give here a sketch of the oral side of this species (fig. 2 a) in order 

 to show the shape of the plates, which is not seen distinctly in either Koehler's or 

 Doderlein's figures. Koehler states that the two first pairs of pores are without papillae, 

 and his pi. xi, fig. 6 (op. cit., 1912) shows it distinctly. Doderlein {op. cit.) states that 

 only the first pore pair is without papillae, and this is clearly indicated in his figure 

 (Taf. i, fig. 4). The apparent contradiction is due to the fact that the first pair of pores 

 in Koehler's figure are the outer mouth pores. But these are covered over by a thick 

 skin which closes up the distal half of the mouth slits. Only when this skin is dissolved 

 do these pores become distinct. An indication of this skin covering the mouth slit is 

 seen on the right side, the upper arm, in Doderlein's Taf. i, fig. 4. 



Astrochlamys sol, n.sp. 



(Plate VII, fig. 9) 



St. 170. 23. ii. 27. Off Cape Bowles, Clarence Island, 342 m. i specimen, attached to a coral-like 

 Bryozoan. 



Diameter of disk ca. 13 mm., length of arms ca. 50 mm. Arms 10. 



In its general characters this species closely resembles A. bruneus. Mouth papillae 

 not distinct, being covered by the thick skin that invests the whole animal. First pair of 

 arm pores apparently rudimentary. As in ^, bruneus there are one or two spines (papillae) 

 at the second pore pair, three at the third pair, and thereafter four spines. These latter 

 are slightly different from those of A. bruneus, having fewer thorns (Figs. 2 c-d). The 

 hooks are alike in both ; the hook belts are interrupted in the dorsal median line in the 

 proximal part of the arms. In regard to the plates of the oral region it appears that the 

 buccal plates are somewhat better developed than in A. bruneus. Ventral plates of arms 

 irregularly divided as in bruneus. 



Not thinking it desirable to remove the specimen from the Bryozoan to which it 



clings, or to spoil it too much by cleaning off the skin, I cannot give any detailed figures. 



But the species is so markedly different from the five-armed A. bruneus by reason of its 



numerous arms that the characters here given should suffice for recognizing it with 



certainty. 



Astrohamma tuberculatum (Koehler) 



Astrothamnus tuberculatus, Koehler, 1923. Swedish Antarct. Exped. Asteries et Ophiures., 



p. 133, figs. I a-f. 

 Asiroioma tuberculatum, Doderlein, 1927. Indopacifische Euryalae, p. 21. 

 Astrohamma tuberculatum, Doderlein, 1930. Deutsche Tiefsee-Exped. Ophiuriden. II, 



Euryalae, p. 372, Taf. i, fig. 2 (p. 363, fig. 14 n). 



St. 190. 24. iii. 1927. Bismarck Strait, Palmer Archipelago. 315 m. 2 specimens. 



These specimens are 15-16 mm. in diameter of disk, thus somewhat larger than those 

 hitherto recorded (8-10-5 mrn-)- They conform perfectly to the descriptions given by 

 Koehler and Doderlein and do not call for further remarks. 



