208 BULLETIN OF THE MUSEUM OF COMPARATIVE ZOOLOGY. 



ABBREVIATIONS. 



The right side of the animal is indicated by the letters dx. t the left side by s. These 

 letters are usually affixed to one or more of the abbreviations used to desiqnate organs. 

 The skeleton figures immediately under the number of a figure on the plate indicate the 

 number of the section in the series to which the figure belongs. Consult also " Index to 

 Stages " (p. 207). 



ab. Abdominal ganglion. lab. 



ab.-vsc. Abdomino-visceral connective. Ins. 



an. Anus. lob. lat. 



buc. Buccal ganglion. loph. cil. 



cav. mt. Mantle cavity. mt. 



ceb.-buc. Cerebro-buccal connective. n. 



ceb. dx. Right cerebral ganglion. nph- 



ceb. s. Left cerebral ganglion. oc. 



ceb.-pd. Cerebro-pedal connective. o cy. 



ceb.-plu. Cerebro-pleural connective. cc. 



cnch. Shell gland. pd. 



com. a. Anterior pedal commissure. pes. 



com. buc. Buccal commissure. plu. 



com. ceb. Cerebral commissure. plu.-pd. 



com. pd. Pedal commissure. plu.-vsc. 



com.pd.a. Anterior pedal commissure. prf. 



com.pd.p. Posterior pedal commissure. rad. 



dt. sx. pr. Primary sexual duct. ret. ta. 



dx. Right. s. 



en. Entoderm. sul. plu. 



gl. pd. Pedal gland. ta. 



gl. sal. Salivary gland. ta/ 



gn. Ganglion. vsc. 



iv. ceb. Cerebral invagination. vsc.-plu. 



Upper lip. 

 Lens. 



Lateral lobe of brain. 

 Ciliated ridge. 

 Mantle. 

 Nerve. 



Nephridial organ (primitive kid- 

 Eye, (ney.) 

 Otocyst. 

 CEsophagus. 

 Pedal ganglion. 

 Foot. 



Pleural ganglion. 

 Pleuro-pedal connective. 

 Pleuro-visceral connective. 

 Cell proliferation. 

 Radula sac. 



Retractor muscle of tentacle. 

 Left. 



Pleural groove. 

 Ocular tentacle. 

 Labial tentacle. 

 Visceral ganglion. 

 Viscero-pleural connective. 



