BY C. HEDLEY. 



93 



described Calobates, Gould>' Another genus imperfectly known, 

 but perhaps also to be ranked under Calobates, is Lyrodios, Gould, 

 type Teredo chlorotica, Gould, f "from ships that have cruised in 



the Pacific." 



Calobates fluviatilis, n.sp. 



(Figs. 1-6.) 



For specific identification of the members of the genus 

 Calobates, I rely on one part of the valve only,— the anterior 

 section or auricle, of which the 

 interior aspect is the charac- 

 teristic. This portion of the 

 valve (rigs. 1-2) is that which 

 in life is protected from fric- 

 tion by the soft parts, and 

 whose development is not in- 

 terfered with by the station 

 of the animal. In the present 

 species the anterior dorsal 

 margin is straight and sloping, 

 the anterior edge of the auricle 

 is gently curved and meets the margin of the antero-median 

 area at a wide angle. From the hinge process a spur is seen 

 in profile, viewed from the anterior side, to project (fig. .3). 

 The height of the valve figured is 10 mm , and the length 

 the same. The remainder of the characters correspond to those 

 of {T.J edax previously described in these Proceedings. The 

 palettes (figs. 4-5) are usually much worn by friction; a well 

 preserved specimen selected for illustration is 17 mm. in total 

 length, straight and asymmetrical, the blade twice the length 

 of the stalk, on one side the flat blade is hatchet-shaped, on the 



* Proc. Boston Soc. Nat. Hist. viii. 1862, p. 283. 



t Invertebrata of Massachusets, 1870, p. 34, fig. .360. Tryon consiflers 

 (Structural and Systematic Conchology, iii. 1884, p. 123) that Lyroilns 

 may belong to Nausitoria. Indeed it is possible that chlorotica may be 

 ■■iaidii. 



