LOLIGO PEALEII. 141 



Cut a median sagittal section of the buccal mass and notice 

 the mouth cavity, the jaws, the muscles that move the jaws, the 

 tongue, and the position of the radula. Is the radula arranged 

 in the strap-over-pulley manner that it is in Sycotypus? 



Draw a figure of the section. 



Male Reproductive System. 1. The testis (morphologically 

 the left) is large, white, and flattened, and lies far back in the 

 pointed end of the body. It is enclosed in a sheath which 

 serves to collect the liberated sperm. 



2. Just anterior to the testis is a small rounded vesicle, the 

 ampulla, which is the point of origin of the vas deferens. 



3. The vas deferens is a plaited slender tube, which being 

 packed with sperm is opaque white. It extends from the am- 

 pulla along the right side of a large sac to be referred to later, 

 the spermatophoric sac, to and beneath (dorsal to) the spermato- 

 phoric organ, where it joins a portion of the organ on its left side 

 about one-third the length of the organ back from its anterior 

 end. Remove the left gill and branchial heart and strip away 

 the thin tissue that covers the vas deferens and spermatophoric 

 organ, being careful not to injure either. Carefully lift the 

 right ventral side of the spermatophoric organ and see where 

 the vas deferens enters it. Drop the spermatophoric organ 

 into position again. 



4. The spermatophoric organ lies almost on the left side, but 

 a little ventrally. In it the spermatophores are formed. It 

 consists of a series of glands and mechanical arrangements that 

 secrete and wind materials into spermatophores. Briefly, the 

 parts are: 



(a) On the right dorsal side, the part joined by the vas 

 deferens, the mucilaginous gland. This consists of two 

 parts. 



(6) Ejaculatory apparatus gland, which extends from the 

 mucilaginous gland posteriorly and then ventrally. Both 

 ends of this gland are marked by constrictions. 



(c) From this gland forward to a narrow duct is the middle 

 tunic gland. 



