366 EDWARD S. MORSE ON 



(57 : 5, 5a) . The egg has a radially striated cell membrane, not the zona radiata of 

 embryologists (57 : 55) . I have observed at the same period, individuals with the body 

 cavity filled with yellow masses, easily distinguished by the unaided eye as ova, while other 

 individuals were equally filled with white sperm masses. The spermaries form large irregu- 

 lar bunches springing from the genital band; they consist of agglomerations of sperm cells 

 and the spermatozoa are detached in groups (57 : 2, 2a) . The irregular shape of the stom- 

 achal glands, as well as of the ovarian masses is well shown in 57: 1, while 57 : la and \h 

 show the appearance of the two masses respectively. In L. lepidula, the ova are in rounded 

 clusters, a clear interspace showing at the end of each egg (57 : 4) . In L. anatina the 

 masses recognized as testes were lobulated, these lobules numbering seven or more in a 

 group (57 : 3) . The whole mass was white in color, differing in this respect from the ova. 

 Each lobule was filled with minute, round cells. In another drawing of i. anatina (47: 7) 

 there appeared an irregular digitated band running midway between the intestine and the 

 oblique muscles on each side which, at the time of observation, I noted as testes. Certain 

 lobular masses in this figure are either immature ova or testes, and if ova, what are the di- 

 gitated bands? They cannot be testes as the sexes are distinct in Glottidia and presum- 

 ably in all the Lingulidae if not in all the Ecardines. In D. lamellosa the eggs are 

 attached in clusters to the gastro-parietal band. In 57 : 7, the attachment of this band is 

 shown running from the sides of the intestine to the outer and posterior dorsal edge of the 

 great occlusor. In the figure, this band is turned forward to show more clearly its relation 

 to the surrounding parts. In 57 : 8 is represented a portion of this band more highly 

 magnified ; the strands running off from the edge of the band and loaded with eggs are 

 the result of proliferation ; 57 : 9 presents the appearance of four clusters of eggs united 

 by genital strands, and 57 : 10 shows the appearance of a single cluster. The eggs are 

 globular and of all sizes. In the figure may be seen a thread running down on one of 

 the strands, upon which are exceedingly minute cells which are probably immature 

 eggs. The eggs are brownish in color and this is probably their natural color unaffected 

 by their preservation in alcohol. In Biscinisca stella the eggs are light brown (57 : 6) . 

 Adult individuals were filled to repletion with eggs, and in separating the animal from 

 the rock, eggs escaped in profusion. In T. septentrionalis, the eggs are spermaceti- 

 white in color, opaque, and resemble a fine white powder when deposited. 



The eggs are thrown out of the pallial cavity and accumulate in piles in front of the 

 animal as well as hang in festoons from the setae. In some instances the eggs were active 

 on the day of their discharge and moved away by the action of the cilia that encircle 

 them ; in other instances the eggs did not move away for three days. At 58 : 1 is repre- 

 sented an adult individual in the act of ovipositing. Eggs were found in abundance in 

 individuals measuring only 5 mm. in length and were found in equal abundance in all sizes 



