AGALMA. 77 



an inch long. The contained ovum is nearly as large as the gynophore, and has a pale, 

 granular yelk, a clear, spherical germinal vesicle of jiijth of an inch, and a thick-walled, 

 vesicular, germinal spot of yi^th of an inch. 



The gonocalyx remains in a very rudimentary state, closely embracing the ovum. It 

 exhibited no terminal aperture in any specimen I examined, and its canals were narrow, 

 straight, and unconnected by any circular canal at their extremities. The inner wall of the 

 calyx was only separated from the wall of the ovisac or manubrium over irregular spaces, thus 

 giving rise to a system of canals like those in the same position in the gynophore of Athoryhia, 

 only less complete. 



The androphores are oval bodies, seated on very short peduncles, and ^th of an inch or 

 more in length. They commence their development as processes of the endoderm and ecto- 

 derm, in which the four canals are developed in the ordinary way ; but some of these would 

 appear to become obliterated with age, as those which were fully formed rarely possessed 

 more than from two to three canals, and exhibited only indications of the circular canal. 



The manubrial spermsac was not distinctly separated from the calyx in the largest 

 specimen I examined, nor did any exhibit fully-developed spermatozoa. 



I obtained on one occasion the young Agahna (possibly of this species), about two lines 

 long, which is represented in PI. VII, fig. 12. The unilateral attachment of all the 

 appendages was very obvious in this young individual. There were — Istly, immediately below 

 the pneumatophore, a series of young nectocalyces, the largest of which measured about 

 T^th of inch in length, and had an apical opening to its rudimentary nectosac, with four canals 

 not yet united by a circular canal; 2dly, a series of caeca, the rudiments of the hydrophylha; 

 3dly, polypites in various stages of development. The only perfect one was terminal, and half 

 as large as the rest of the animal. It was suspended by a pedicle, and presented a pyloric 

 valve at its junction therewith. The upper third of the polypite had a globular form, and 

 was of a dark reddish colour. Its endoderm was raised up into longitudinal ridges, in which 

 a great number of round fatty-looking particles were imbedded. Besides these, other smaller 

 villous processes, similar to those in the polypites of Diphi/es, were scattered about. A coiled 

 filament, probably the rudiment of a tentacle, arose from the neck of the polypite, and gave 

 off lateral buds, the most fully developed of which were cylindrical processes, terminated by 

 rounded heads containing many thread-cells. 



I am unable to identify the Agalma which has just been described with any published 

 species. It presents some points of resemblance with the A. Okenii of Eschscholz, others with 

 the Stephanomia intermedia of Quoy and Gaimard ; but there are well-marked differences in 

 each case. I therefore give it the specific name of A. breve. 



