SEA-FISHERIES LABORATORY. 485 



EXPLANATION OF PLATER. 



Reference Letters. 



a. ace. — Anterior accessory muscle of the scaphognathite. 



a. art. — Antennary artery. 



ab. 1 — 6. — Abdominal somites 1 to 6. 



abd. — Abdomen. 



abs. — Lines of absorption. 



a. ex. B. — Tendon of the anterior extensor of basi-ischium of chela. 



af. — Afferent branchial sinus. 



af. 1. — Do. of the podobranch of the second thoracic somite. 



af. 2. — Do. of the arthrobranch of the second thoracic somite. 



af. 3. — Do. of the podobranch of the third thoracic somite. 



af. 4. — Do. of the anterior arthrobranch of the third thoracic somite. 



af. 5. — Do. of the posterior arthrobranch of the third thoracic somite. 



af. 6. — Do. of the anterior arthrobranch of the fourth thoracic somite. 



af. 7. — Do. of the posterior arthrobranch of the fourth thoracic somite. 



af. 8. — Do. of the pleurobranch of the fifth thoracic somite. 



af. 9. — Do. of the sixth thoracic somite. 



a. f. fi. — Anterior flexor of the flabellum of the first maxillipede. 



a. gl. — Antennary gland. 



a. t. p. — An tero -inferior pyloric ossicle. 



a. lb. — Antero -lateral lobe of the bladder. 



a. mes. — Anterior mesopyloric ossicle. 



amp. — Pyloric ampulla. 



amp. C. — Supra-ampullary ridge. 



a x . n. — Nerve of the first antenna; a' 2 , n. — Nerve of the second antenna. 



ant. — Second antenna ; ant le - — First antenna (antennule). 



a. oe. lb. — Anterior oesophageal lobe of the bladder. 



ao. lb. — Outer portion of the antero -lateral lobe of the bladder. 



a. ost. — Anterior ostia of the heart. 



a. pi. — Anterior pleuropyloric ossicle. 



apoph. — Apophysis of the mandible. 



art. 1 — etc. — Branches of the sternal artery supplying the first and 



following post-oral cephalothoracic appendages. 

 a. s. — Antero-superior dilator muscles of the fore-gut. 

 a. s. a. — Anterior supra-ampullary ossicle. 

 as. lb. — Anterior oesophageal lobe of the bladder. 



a. t. I. — Lateral accessory tooth. 



B. — Basipodite. 



be. 1 — 5. — Branchio-cardiac veins 1 to 5. 



B-I. — Basi-ischiopodite. 



bl.— Bladder. 



b. m. — Basement membrane. 

 br.— Gills. 



br. ch. — Branchial chamber. 



br. e. — Branchial excretory organ. 



br. s. 1 — 5. — BranchiaJ sinuses I to 5. 



C. — Coxopodito 

 C 1 . — Carpopodite. 

 caec. — Mid-gut caecum. 



c. al. — Antero-lateral cardiac muscles. 

 c. ant. — Anterior cardiac muscles. 

 card. — Cardiac portion of the fore -gut. 



cd. 1. — Dorsal antero-lateral muscles of the heart. 

 cd. 2. — Ventral antero-lateral muscles of the heart. 



