OF MOLLUSCA. 215 



base produced into an arched neck, unarmed, the tip rounded ; second 

 very large, stout, tip clavate, bimucronate, scape inflated ; third and 

 following gradually smaller, simple, somewhat rectangular (fig. 117)." 

 — Loven. 



2. EuPLOCAMUS. 



Body rather depressed ; cloak small, covering the head ; the edge 

 surrounded with branched appendages. Dorsal tentacles laminated, 

 sheathed ; oral tentacles in form of oval lobes. Branchiae non-re- 

 tractile. Lingual membrane broad. Teeth numerous, elongate, the 

 three innermost on each side with large broad spines ; no central 

 plate ; buccal collar spinose. 



1. E. crocea, t. 67. f. 3, t. 231. f. 15. 



2. E. frondosa, t. 231. f. 1. 



3. E. lacunosa, t. 231. f. 6. 



3. Plocamoceros. 



Body limaciform. Mantle obsolete, forming an expanded veil 

 over the head, with branched appendages, and two or three tubercles 

 on each side of the back. Dorsal tentacles laminated ; oral tentacles 

 flat. Branchiae branched, non-retractile ; a fin- shaped keeled ridge 

 down the hinder part of the back of the tail. Tongue ? Jaws 



1. P. ocellatus, t. 69. f. 1. 



2. P. (Peplidia) Maderae. 



** Dorsal tentacles linear, smooth. Teeth simple, uniform. 



4. iEGIRUS. 



Body convex, covered with tubercles ; cloak indistinct, forming a 

 veil over the head and a tubercular ridge on each side. Dorsal ten- 

 tacles two, linear, smooth, with wide sheaths. Branchial plumes non- 

 retractile. Lingual membrane broad, with numerous simple curved 

 lateral spines ; no central plate ; an upper corneous jaw. 



1. M. punctilucens, t. 204. f. 9, t. 231. f. 12, t. 274. f. 2; Forbes 



$• Hanley, B.M. t. A.A.A. f. 2. 



2. M. Lessonii, t. 204. f. 9. 



" Central tooth of Mgirus punctilucens wanting ; lateral teeth 

 about 17, simple, each forming a bent hook." — Loven. 



Fam. VI. CERATOSOMID.E. 



Lingual membrane broad. Teeth conical, spinose, in numerous 

 similar longitudinal rows ; no central series. Buccal collar spinose. 

 Cloak indistinct, simple. Dorsal tentacles laminated, sheathed, not 

 retractile. Gills plumose, retractile into a cavity. Body compressed, 

 elevated. 



