260 



TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



EXPLANATION OF PLATES. 

 Reference Letters. 



abd. ao. = Abdominal aorta. 



aff. br. = Afferent branchial vessel. 



alb. gl. = Albumen gland. 



an. = Anus. 



an. f. = Anal funnel. 



an. in. = Anal incision in shell. 



an. n. = Anal nerve (E2). 



ant. ao. = Anterior aorta. 



ant. giz. = Anterior portion of giz- 

 zard (first triturating stomach). 



ant. giz. t. = Tooth of anterior 

 portion of gizzard. 



ant. ped. a. = Anterior pedal artery. 



ant. ped. gl. = Anterior pedal gland. 



ant. tent. = Anterior tentacle. 



ant. tent. a. — Anterior tentacular 

 artery. 



ant. tent. n. = Anterior tentacular 

 nerve. 



ap. pn. = External aperture of penis 

 sheath. 



and. n. = Auditory nerve (A6). 



aur. = Auricle. 



b. sem. = Bursa seminalis. 



b. sem. gl. = Glands of bursa semi- 

 nalis. 



b. w. a. = Artery to body wall. 



bas. m. = Basal muscles of buccal 

 mass. 



br. g. = Branchial ganglion. 



br. n. = Branchial nerve (D2). 



br.nl. = Nerve to ctenidium. 



buc. cav. = Cavity of buccal mass. 



buc. f. = Buccal fold. 



buc. g. = Buccal ganglion. 



buc. m. = Buccal mass. 



buc. n. 2 = Nerve to basal muscles 

 of buccal mass (F2). 



buc. n. 3 = Nerve to lateral muscles 

 of buccal mass (F3). 



c. buc. conn. = Cerebro-buccal con- 

 nective. 



c. comm. = Cerebral commissure. 



c. g. = Cerebral ganglion. 



c. gen. ap. = Common genital aper- 

 ture. 



c. pi. conn. = Cerebro -pleural con- 

 nective. 



caec. = Caecum. 



caec. a. = Caecal artery. 



caec. v. = Caecal valve. 



cart. = " Cartilage " of odontophore. 



centr. t. = Central tooth of radula. 



ceph. a. = Cephalic artery. 



con. = Concavity of shell into which 

 liver projects. 



conn. = Connective tissue. 



cr. = Crop. 



cr. ao. = Crista aortae. 



ct. = Ctenidium. 



d. hep. a. = Deep hepatic artery. 

 dors. a. = Dorsal artery. 



dors. b. w. = Dorsal body wall. 



e. = Eye. 



ejf. br. = Efferent branchial vessel. 



eff. ren. = Efferent renal vessel. 



/. = Foot. 



fert. ch. = Fertilisation chamber. 



g. oes. a. = Gastro-oesophageal 

 artery. 



g. oes. n. = Gastro-oesophageal nerve 

 (El). 



gen. a. = Genital artery (from 

 anterior aorta). 



gen. a I . = Genital artery (from 

 abdominal aorta). 



gen. g. = Genital ganglion. 



gen. n. = Genital nerve (E3). 



gt. = Gutter between mouth and 

 foot. 



