Quarterly journal of microscopical science . andular wall in its middle other Aeolidiomorpha have their male and female openingsapproximated in a common atrium, except Fiona, but themale opening of Calma is placed in front of and below the levelof the right rhinophore (see fig. 1). while the female openingoccupies the usual position between the firsl and second ceratalgroups on the right. It is curious that, along with this primitiveposition, the male organ itself has a primitive structure reminis-cent of the Bullids, especially Haminea. II is a partial pleurec-bolic introvert . th
Quarterly journal of microscopical science . andular wall in its middle other Aeolidiomorpha have their male and female openingsapproximated in a common atrium, except Fiona, but themale opening of Calma is placed in front of and below the levelof the right rhinophore (see fig. 1). while the female openingoccupies the usual position between the firsl and second ceratalgroups on the right. It is curious that, along with this primitiveposition, the male organ itself has a primitive structure reminis-cent of the Bullids, especially Haminea. II is a partial pleurec-bolic introvert . the penis sac in the retracted condition contain-ing the unchanged apex of the penis as a conical papilla onwhich opens the vas deferens. Close to the end the deferentduct receives that of a long tubular gland (<) resembling the CALMA GLAUCOIDES 449 organ named prostate in the Bullids. When retracted thisgland lies along with the terminal coils of the vas deferenstucked away in the head above the brain, but is partly drawn Text-fig. Dissection of the reproductive system of a small, nearly matureindividual, amp., ampulla of , the sperm-oviduct; ;i. , male and female acini ; and , male and femaleopenings; , glandular appendage of the penis; j; , vasdeferens; , coils of the oviduct similarly numbered inText-fig. 3. into the everted penis, giving it its shape and firmness. Thelarge cells lining it contain a clear secretion which, unlike thegranular contents of the prostatic cells of the vas deferens, 450 T. J. EVANS takes up no dyes, acid or basic. The fact that no other Aeolidio-morph possesses such a glandular appendage of the penis addsto the interest of this coincident acquisition of primitiveposition and structure. The female duct is in very young specimens a straightbroad tube le
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