Gnthj Marine Lahoratori/, St. Andrexcs. 21 



hc'twccu the dorsal and ventral divisions, is a flcsliy process, 

 .adherent dor-ally and pointini^ ventrally, separated by the 

 t\vo setigcrous pr()ees«<es at the tori, and reseriihling those 

 of MaJdanc crisfaf/alli, Claparede. Anal segment aclnetous ; 

 anus near the viMitral edge, whereas in Maldane it opens 

 towards the dorsum. Two or three furrows arc ])rolonged 

 from the ventral to the dorsal surface — which De St, Joseph 

 regarded as rudiments of segments. 



The cephalic region of a specimen sent by ^fr. Southern from 

 Blaeksod Bay resembles that in Nicomachc, though somewhat 

 longer and more projecting ventrally. A keel arises a little 

 above the mouth and runs vertically to the dorsal edge. The 

 surface is speckled with pigment as in Nicomache 7naculata. 

 Each of the three following segments bears a spine below 

 the dorsal tuft of bristles, four of these tufts characterising 

 the anterior region. Three long segments follow those with 

 the spines, the third the longest, with two hook-rows, viz., 

 an anterior and a posterior. This segment is of softer con- 

 sistence than those in front. The anal plate has an expanded 

 smooth margin, which projects freely all round, except dorsally, 

 and has the anus on its posterior surface a little within the 

 ventral broad rim, and it shows a radiate arrangement of its 

 margin. Apparently two narrow rings next it are achaetous, 

 that in front of these has a row of hooks and a tuft of 

 bristles of considerable length. The dorsal surface of the 

 third, fourth, fifth, and sixth segments in front of the anal 

 ])late present a median conical free flap pointing backward, 

 the third having a pedicled process like a Loxosoma attached 

 to it. These eminences increase in prominence from the 

 sixth backward, 



Tlie bristles of the first region (four segments) are pale 

 golden and brittle, having a straight shaft and a curved, 

 tinely-tapered tip with narrow wings. The spine in these 

 segments is stout, golden, and pointed, the tip being slightly 

 hooked. 



The bristles of the middle region are pale golden and of 

 two kinds, a stronger series of al)out five with stout shafts 

 and tapering winged tips, and a more numerous group of 

 slender capillary bristles which extend considerably beyond 

 the former. The tips of the stout series in front of the tail 

 are somewhat longer, but the capillary bristles are shorter, 

 for they do not reach the extremities of the stout forms. 



The hooks in the smaller example are stout and rather 

 short, with a base dilating up to the shoulder, which has a 

 hump posteriorly ; then the neck is narrowed where it is 



