410 Messrs. Alder and Hancock on a proposed New Order 



of the body ; the other (//) lies on the left side immediately be- 

 hind the buccal mass, and extends backwards as far as the middle 

 of the body. This organ is composed of large globular vesicles 

 of a yellow colour, six of which make up the posterior, and four the 

 anterior portion. The ova are generated in the interior of these 

 vesicles, which arc united by short ducts into pairs ; each pair 

 having a single channel of communication with the central duct. 

 Thus it would appear that the ovary as well as the testis has a 

 dichotomous arrangement. The channels of the two portions of 

 the ovary are united near the median line of the body, a little in 

 front and to the left of the union of the two divisions of the 

 testis; and almost immediately after their junction, the common 

 oviduct, passing towards the right side, is suddenly enlarged and 

 doubled once or twice upon itself (i) ; it is then as suddenly con- 

 stricted, and shortly afterwards reaches the tube of the penis at j, 

 just in advance of its union with the testis, as before stated. At 

 this point the tube of the penis is attached to the upper surface 

 of a large pellucid gland (k), which lies along the right side of 

 the body, extending from the base of the penis to the orifice 

 leading to the spermatheca. The colour and general appearance 

 of this organ resembles that of the mucous gland of Eolis, and 

 like it, no doubt, secretes the transparent jelly-like envelope that 

 covers the eggs. This gland is of an irregular form, but neither 

 its shape nor general structure could be determined with preci- 

 sion, on account of the distortion produced by the compressor. 

 The opake granular portion associated with this gland in Eolis 

 would appear to be wanting, unless the two glandular-like organs 

 (m), before noticed in connexion with the tube of the penis, are 

 the homologues of this part, which we are rather inclined to think 

 is the fact. 



The mucous gland terminates in front in a widish channel 

 which opens externally (I) immediately behind the base of the 

 penis. It is through this opening that the spawn, as before 

 stated, issues from the body ; but we have not been able to ascer- 

 tain how the eggs reach this channel : most probably the oviduct, 

 shortly after its junction with the tube of the penis, sinks down 

 into the channel of this gland ; and thus, as in Eolis, the passage 

 for the eggs is accomplished. Whether this be the mode of com- 

 munication or not, it is certain that the eggs find their way into 

 the channel and anterior portion of the mucous gland, for we 

 have had ocular proof of the fact. On one occasion, observing 

 an individual spawning, we placed it in the compressor, and de- 

 tected numerous ova, as described, in the anterior portion of the 

 gland and also in the channel : a little more pressure forced them 

 out at the orifice. 



The spermatheca (q) is an oval sac of considerable size and of 



