98 ZOOLOGICAL COLLECTIONS MADE DURING [Jan. 4, 



The madreporic plate is obscured by the paxillae, which are 

 nowhere arranged in regular rows. The interpaxillar area is 8 

 millims. wide at the base of the arm, and 1 millim. at the apex ; the 

 total width of the arm at the base is 15-3 millims., and at the tip 

 2'2 millims. 



Ophitjroidea. 



Ophiurida. 

 Ophiactis asperula. 



■Ophiolepis asperula, Phihppi, Archiv fiir Naturg. (1858), p. 267. 



Ophiactis asperula, Liitken, Addit. ad Hist. Oph. ii. (1859), 

 p. 130, footnote. 



Ophiactis mag ellanica, Ljungman, Vetensk. Akad. Forh. 1866,. 

 p. 164. 



Ophiactis asperula, Lyman, Bull. C. M. Z. vi. 2, p. 41. 



(1) Port Rosario, 2-30 fms. ; bottom, sand and rock. 



(2) Tom Bay, 0-30 fms.; bottom, rock, kelp, and mud. 



(3) Ehzabeth Island, 6 fms. ; sandy bottom. 



(4) Sandy Point, 9-10 fms.; bottom, mud. 



(5) Borja Bay, 14 fms. ; bottom, shell and stones. 



Ophioscolex coppingeri, sp. n. (Plate VIII. fig. 6.) 



This species is to be at once distinguished by the irregular dis- 

 tribution of the uppermost row of arm-spines, which are, though 

 not regularly, set almost alternately in an upper and a lower plane. 



The disk is rounded in the larger, subpentagonal in the smaller 

 specimen. Arms long, slender, delicately tapering, widest at the base, 

 with three lateral arm-spines, of which the uppermost, which is a 

 little the longest and of about the same length as an arm-joint, is 

 not always placed at the same level, but is not unfrequently higher 

 up or lower down on the side of the arm than is the corresponding 

 spine of the next joint. The three or four outer mouth-papillae are 

 short and spinous ; the most central is broadened out and pectinate 

 at its margin, closely resembling the teeth, of which there are at 

 least three in each jaw. The buccal shield is only visible when 

 the skin is removed, is somewhat ovoid, with the narrower end in- 

 ternal. There is a deep notch on the upperside ot each arm-joint, 

 so that the dorsal plates are only near one another in the middle 

 line, but the calcareous plates do not here even touch one 

 another ; along the upper median line there runs a well-marked 

 groove, an indication of which, as passing all along the arm, can be 

 made out even before the skin is removed ; the lower arm-plates 

 are regular and oblong. Genital slits rather long. 



The following are the more important measurements of the 

 largest specim^ii : — Diameter of disk 205 millims. ; length (longest) 

 arm 80 millims. ; breadth of arm (at base) 3 millims. ; length of 

 genital slit 4 millims. 



Three specimens, one with the disk injured, were collected at Tom 

 Bay, 0-30 fms. ; bottom, rock, kelp, and mud. 



