lil.OOMF.R : ANATOMY OF CERTAIN SPECIES OF SOLENiDAE. 83 



siphon (fig. 7, In. S & Ex. S.). The latter is of consideral>le length and 

 very muscular. Nearly the whole of the free portion is missing, so it is not 

 possible to form any idea as to its length, or to say, if the exhalent portion 

 is separate from the inhalent one as in ^. sfrif/illafus (fig. 7, Ex. •>'. and 

 I?i. s'.). 



The la')ial palps are relatively short and wide. The gills pass pos- 

 teriorly from the labial palps to the posterior end of die proximal portion 

 of the siphon, and. on the outside of them, the bases are connected with 

 the lateral siphonal ridges (fig. 7, S R.), while on the inside they are joined 

 together as in '. sfrifjillatus. 



A strong muscular dorsal integument is present resembling that of 

 Soleti and Eiisit<. 



The kidneys extend slightly literally along the mantle lobes as in 

 S. sfri(jillatu!<. 



The foot (fig. I, F.) is long and of nearly uniform depth. It, however, 

 gradual'y increases in width towards the distal end, near which it is almost 

 round, but suddenly tapers off at the extremity. 



i. Pallial nmsdeti. — The muscles of the mantle lobes form a deep band 

 of muscles lying at right angles to the pallial edge, and are further 

 strengthened by a band of longitudinal muscles along the concresced ven- 

 tral part. The proximal portion of the siphon (fig. 7, Ex. .V. and l7i. .^.) is 

 long, the arrangement of the muscles being similar to that of S. strigillatus, 

 viz., large longitudinal muscles, covered intemally by a muscular lining, and 

 externally by the muscular integument. 



Anteriody the longitudinal muscles converge to form the siphonal 

 retra< tor muscles, but they do not present nearly so large a surface where 

 they adhere to the shell as in ^'. strujiliafus. Between the proximal portion 

 of the siphon and that representing the free portion are two muscuhir flaps 

 or valves. This applies to the exhalent as well as to the inhalent chamber. 



The anterior adductor muscle (fig 7, /l.T ) is a broad and deep muscle, 

 flattened dorsally, and curved ventrally. It is joined anteriorly with the 

 dorsal integument and mantle lobes, and posteriorly with the ventral integu- 

 ment. Tne posterior adductor muscle (fig. 7, P. A ) is similar to the 

 anterior adductor muscle, but is not so deep. It is joined anteriorly with 

 the retractor pedis pos'erior muscle and the doisal integument, and pos- 

 teriorly with the siphon, the mantle lobes, and the dorsal integument 



//. Pe'Ia/ musr/rx.— The longitudinal muscles of the foot are strongly 

 developed and interspersed with a great number of transverse ones, the latter, 

 however, are not so nimierous as in S. sfrujillafus, but more so than in 

 Sulen. 



The free [jortions of the retractor pedis anterior muscles (llg. 7, P.li.A.) 

 are short and laige When the muscle reaches the foot it spreads out ven- 

 trally, and passes between the longitudinal pedal muscles, and the pedal 

 integument. 



