Gatty Marine Laboratory ^ St. Andrews. 299 



cirri and a median proopss. The general aspect is pale, 

 with symmetrical brownij^h bars and two median touches in 

 each segment. De St. Joseph describes the proboscis as 

 unarmed, and furnislied with numerous papillae at the tip. 

 The feet are well developed and, at the reproductive season, 

 the ova pass into them. Dorsally is the long articulated 

 cirrus, and ventrally the siiorter ventral cirrus. At the 

 base of the former is the dorsal sctigerous process bearing a 

 series of long simple bristles, slightly curved, with a ser- 

 rated (spinous) edge, the process being further stiffened by 

 two spines, one of which, curved in the young form, projects 

 amongst the bristles. The ventral series has articulated 

 terminal pieces, more or less bifid, and longer or shorter 

 according to position, the longer dorsal and the shorter 

 ventral. The foregoing description is cliiefly that of 

 Marion and Bobrctzky. Southern states that it swims 

 gracefully througii the water, stops, and even swims back- 

 ward when its progres'S is arrested. 



Castalia fascu, Johnston. — Two varieties of this species 

 were found by Southern on the west coast of Ireland. The 

 first was dredged in Clew Bay in 24 fathoms, on a bottom 

 of sand and shells, and differed from the ordinary form in 

 having red eyes, the absence of spines on tlie terminal 

 portions of the bristles which are shorter and thicker, the 

 terminal pieces tend to be bifid at the tip, and the bevelled 

 end of the shaft is bifid. In the second variety from 

 Ballynakill Harbour, the biistles are similar, but longer, 

 the tips of the shafts pointed, not bifid, the terminal pieces 

 are longer, with fine spikes, and the bifid nature of the tip is 

 more distinct, the coarse spikes on the terminal pieces being- 

 absent. Further, in a numbtr of segments in the middle 

 of' the body the dorsal division has a large curved spine 

 {Southern). 



In Microphthalmus sczelkoivii, Mecznikow, the head is 

 rounded in front, indented posteriorly, with a single pair of 

 black kidney-shaped eyes posteriorly and four slender 

 tapering tentacles anteriorly. A median tentacle occurs 

 at the posterior indentation. The three pairs of tentacular 

 cirri are somewhat enlarged at the base. The body-seg- 

 ments are about forty, and the length 6 mm. The dorsum 

 has ill-defined bands of brown pigment. The dorsal cirrus of 

 the third segment is the longest, and all are about twice as 

 long as the ventral. The dorsal division of the foot carries 

 a single slender spine and a single small bristle with a 

 lyrate tip ; ventral division with a single large spine and 

 a group of Hesionid bristles. 



