ANATOMY oF PELECYPODA BUENE. 241 



At the anterior extremitv of the inner demibraiieli. at the point where it joins the 

 inner labial palp, is a small cup-shaped vestigial "cephalic eve. similar to those 

 described above in l.i**(ir<-<i. ('up-shaped eve-spots of a like character occur in some 

 numbers, along the outer fold of the mantle-edge, particnlarlv in the inlialenl area 

 towards its hinder end. 



Renal (h-i/unx. The kidneys are similar both in genera 1 structure and in the 

 disposition of the ivno-pericardial dud and external opening, and in the union of the 

 latter with the genital duct, to the type of these organs in the genus . |/n/ described 

 by Odhner (8. p. 20S). 



ilill*. The gills are of the usual An;i tvpe. The filaments are united bv ciliated 

 discs at four points on the descending and three on the reflected arm. and there is also 

 close ciliary connection between their reflected extremities and at the angle of reflexion. 

 A short interlaminar membrane fills in the angle of reflexion of each filament. 



LI.MOI'SIKE. 

 4. Lin>o]>.;* </nin<li*. Smith. PL II. figs. 10-12. 



Station l'.>4. Numerous specimens of different sixes obtained off ( >ates Land 

 in 180-200 fathoms. 



The animals of three species () f this genus (7,. /n-liiijii-n. I., miu/itii. and /,. f<ni<; 7/</fn) 

 have been figured and briefly described by Pelseneer (9, p. 12, PL II, Figs. 1 ami 2. 

 and 16A. p. 21). They are chiefly remarkable for the great size and muscularity of the 

 gill-axis. 



A diagrammatic view of the arrangement of the chief internal organs of L. </r<ni<li- 



O " ' <~* ' 



is shown in Fig. 10. to which may be added the following notes : 



Miintlf mid l'"ot. The mantle is without tentacles, papilla;, or eye-spots ; its folds 

 (in cross-section) resemble those of Biirlmtia. 



The byssus is small and filiform : it is formed upon the surface and around flu- 

 base of a long conical and longitudinally pleated papilla, springing from the base of a 

 deep bvssal pit (Fig. 10, f>>/.j>.). 



f \'i iTniix Si/xf< HI in/// Sense- Organs. -The visceral ganglia are coalesced, as they are 

 in l^-i-tuiK-iilii.v, and are of considerable sixe and importance. The branchial nerves that 

 arise from them are large and richly ganglionated, and underlie a well-marked epithelial 

 thickening (Speugel's organ). 



The abdominal sense-organs and otocysts are well developed; the latter retain 

 indications of their original invagination from the exterior in the form of a minute 

 duct. In one specimen this duct was still apparently in open communication with the 

 exterior: in another it terminated in a small dilatation before reaching the surface of 

 the body. 



/)///(. v///v On/aitx. The palps are directly continuous with the lips: tliev are 

 small, though somewhat swollen and little, if at all, fluted upon their appo.-ed surface.-. 

 The inner lip and palp is a simple fold similar from end to end : the outer lip (Fig. 1 1. 



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