348 LIVERPOOL MARINE BIOLOGY COMMITTEE REPORT. 



least in this form, and in those where, owing to the power of 

 movement of the scales, the muscle layer is well developed. 

 Further, the ova frequently become pushed up to form a 

 distinct layer between the muscle and the wall of the caecum, 

 so that a considerable thickness of tissue intervenes between 

 the superficial epithelium and the intestinal wall. 



Finally, the acicular muscles fill up the ccelome beneath 

 the caeca and intestine (PI. VII, fig. 1). The muscles are 

 large, and are attached to the inner end of the aciculum only 

 in a radiating manner. The aciculum has a knob-shaped 

 end, which forms a basis for attachment of the muscles. 

 The acicula are, moreover, connected to each other by muscle 

 bands at their bases (PI. VII, fig. 4). 



(6.) Hermadion assimile, Mcintosh, Trans. Zool. Soc , 

 ix, 387. 



Localities. — St. Andrews ; west coast of Ireland ; south 

 of England ; ofi" the Spanish coast, in the " Porcupine " 

 expedition ; and, by the L.M. B. C, at Bay Fine, near Port 

 Erin, Isle of Man, in ten fathoms, from a gravelly bottom. 



One or two points in the anatomy of this species seem 

 worthy of note. 



The alimentary canal does not present the usual branched 

 lateral caeca which are so characteristic of the Aphroditidae. 

 On the contrary, it presents merely a series of alternate con- 

 stictions and bulgings, the sv/ellings corresponding to the 

 segmental space. The entire canal is lined by granular 

 columnar non-ciliated cells, corresponding to those found in 

 the caeca of the ordinary tj^pe. The parapodia are very large 

 and elongated. Mcintosh figures the spines {loc. cit.) which 

 are tolerably numerous and more uniform throughout the 

 series of parapodia than one usually finds them. Mcintosh 

 mentions the presence of a median tentacle on the head ; 

 that was, however, absent in the specimen obtained ojff the 



