84 BLOOMER : ANATOMY OF CERTAIN SPECIES OF SOLENIDAE. 



The i)edis retractor posterior muscle (fig. 7, P. U.P.) is short and bifur- 

 cated at the free end. The bifurcations pass over the anterior part of the 

 posterior adductor muscle. The muscle on reaching the foot continues as 

 the longitudinal pedal muscles. 



AUmentari/ Canal. — The lips (figs. 8 and 9, A.L. and P.L.), formed by 

 the labial palps, are comparatively wide and project anteriorly. 



The oesophagus (fig. 8 and 9, Oe ) is of medium length, proceeds pos- 

 teriorly, and opens into the oesophageal part of the stomach, The 

 oesophageal division (figs. 8 and 9, Oe. St.) is long and narrow, and dorsally 

 is almost completely separated from the cardiac division by a thick muscular 

 tissue (figs. 8 and 9, Of. G.R.) passing right across the stomach, while on 

 the left side, at the posterior end, is the central division fig. 8, CD.). The 

 cardiac division (figs. 8 and 9, C. -^t ) lies dorsally to the oesophageal one, 

 and on the left side is separated from the pyloric division by the ridge of the 

 central division and another ridge proceeding dorsally from the muscular 

 papilla (fig. 8, MP.). On the right side of the stomach of ihe specimen 

 examined the separation of the oesophageal, cardiac, and pyloric divisions 

 from each other is not so clearly defined. The pyloric division (figs. 8 & 9, 

 P.St.) at its posterior end, continues as the caecum of the cystalline style, 

 (figs. 8 and 9, G.G.). It is large and long, passing with a large curve, first 

 ventrally, then anteriorly, and terminating near the dorsal surface of the 

 -pedal cavity. 



The intestine (fig. 7, In ) leaves the pyloric division slightly to the right 

 of the anterior side of the caecum of the crystalline style. It forms a large 

 number of folds ventrally to the stomach, and, in a more or less folded 

 condition, passes along the dorsal surface of the caecum, returning along 

 its ventral surface, then, taking a large curve goes to the dorsal side of the 

 pyloric division, makes on it a large loop, and, turning posteriorly, proceeds 

 as the rectum (fig. 7, R ) It terminates at the posterior side of the posterior 

 adductor muscle with a bi-lobed anus (fig. 7, A.). 



The liver (fig. 7, L.) lies closely to the stomach extending down the sides 

 and along the greater portion of oesophagus, but the mass of it is under- 

 neath the stomach. The large bile-duct enters the central division, and 

 the smaller one on the ventral surface of the oesophageal division, under 

 the muscular ridge separating it from the cardiac division. 



Nervous xysfem. — The cerebro-pleural ganglia are situated close to the 

 ventral integument, laterally to the mouth. They are joined to each other by 

 a commissure running just in front of the mouth. Anteriorly each ganglion 

 gives rise to only one anterior pallial nerve, which passes along the ventral 

 integument, then under the anterior adductor muscle to the mantle 

 lobe. Posteriorly the ganglion gives off the cerebro-pedal and cerebro- 

 visceral connectives, the latter passes between the viscera and the pedal 

 integument to the retractor pedis posterior mnscle, penetrates its wall, and, 

 emerging, goes along the ventral surface to a viscero-parietal ganglion. 



