BLOOMER : ANATOMY OF PHARELLA AND TAGELUS. 



121 



D.D. Dorso-central division of the P. A. 



stomach. P.D.St. 



Ex.S. Proximal portion of the ex- 



halent siplional chamber. P.L. 



E.c.S' . Free portion of the exhaient P.M. 



siphonal chamber. P.D.R. 



F. Foot. 



F.In. Folded portion of the intestine 

 H. Point where tiie dorsal in- 



tegument is connected P.L. P. 



with the teeth of the shell. 

 In. Intestine. 



Iji.S. Proximal portion of the in- 



halent siphonal chamber. 

 ht.S' . Free portion of the inhalent P.Oe.St. 



siphonal chamber. 

 L. Liver. P. P. A. 



M. Month. 



M.C. Musculns cruciformis, a trans- P. P.P. 



verse muscle, situated 



ventrally to the siphon. P.St. 



31. P. Developed portion of the 



muscular ridge, repre- R. 



senting the muscular S.T. 



papilla of Solcn. 

 M.L. Left mantle lobe. St. 



()e. Oesophagus. S.R.M. 



Oc.C.R. Ridge dividing the posterior T.P.M. 



oesophagael from the T'. 



cardiac portion of the 



stomach. 



Posterior adductor muscle. 



Posterior division of the 

 stomach. 



Posterior or lower lip. 



Muscles of the pallial edge. 



Muscular ridge of the stomach 

 running from the oesopha- 

 gael ridge nearly around 

 the pyloric division. 



Lateral processes from the 

 posterior edges of the 

 mantle lobes, which en- 

 circle and are connected 

 with the siphon. 



Posterior oesophagael division 

 of the stomach. 



Retractor pedis anterior 

 muscle. 



Retractor pedis posterior 

 muscle . 



Pyloric division of the 

 stomach. 



Rectum. 



Tentacles bordering the 

 honal apertures. 



Stomach. 



Siphonal retractor muscle. 



Transv^erse pedal muscles. 



Ventricle. 



sip- 



EXPLANATION OF PLATE X. 



Fig. 1. PharcUa oricntalis, Dunker. View from the right side, showing the 



alimentary canal, &c., x %. 

 Fig. 2. Pharella orientalis, Dunker. Longitudinal section of the stomach, showing 



the internal structure of the left side. x 1 h. 

 Fig. ?,. Pliarella orientalis, Dunker. Longitudinal section of the stomach, showing 



the internal structure of the right side, x \h. 

 Fig. 4. Tagdus riifiis, Spengler. View from the right side, showing the alimentary 



Canal, &c. X li. 

 Fig. 5. Tcigelus rvfiis, Spengler. Longitudinal section of the stomach, showing the 



internal structure of the left aide. X 2. 

 Fig. C). Tagelus rulus, Spengler. Longitudinal section of the stomach, showing the 



internal structure of the right side. x 2. 



