THE NAUTILUS. Bl 
most obviously new or interesting forms were made the subjects of 
brief diagnoses which were gathered into a paper for the American 
Journal of Couchology. This preliminary paper included a brief 
diagnosis of a remarkable Pteropod, of which the types are still extant 
in the National Museum, which was described (op. cit. vol. 7, pp. 
137-8), under the name of Corolla spectabilis n. g. and sp., and sup- 
posed to have no shell. These animals caught in the N. Pacific, Lat. 
42°50’, W. Lon. 147°25’, in the tow-net, were preserved alive for 
three days and carefully drawn to scale in water colors before being 
consigned to spirits for preservation. As they seemed lively and 
perfect the conclusion was natural that they were normally shelless. 
Subsequently, on my return to civilization in 1875, after much study 
[ became convinced that these animals were more related to Tied- 
mannia but had lost their shell. The latter is gelatinous, slipper- 
shaped, and covered with small tubercles weighing several times as 
much as the animal, which is very slightly attached to it and is 
therefore detached with great facility. The genus Gleba Forskal was 
similarly described from a detached animal. 
In his report on the Pteropoda of the Challenger Expedition, Dr. 
Paul Pelseneer received from me copies of all my unpublished 
sketches and specimens of several of the species, though not of Corolla 
-spectabilis as the jar containing the latter was temporarily imaccess- 
ible. A brief description of the shell was also sent. In his report on 
the Challenger Pteropods he combines with my sketch and diagnosis 
certain defective fragments collected by the Challenger party which 
appeared to him to belong to the genus Gleba, to which he accord- 
ingly referred C. spectabilis; the name Corolla naturally becoming 
in this way a synonym of Gleba. 
But the “shell” of Gleba is of a totally different character from 
that of Corolla. It is almost flat, shallow and not slipper-shaped. 
‘The detached “shells” which I took in the tow-net about the time I 
collected the types of Corolla do not resemble Gleba, but are nearly 
identical with those possessed by Cymbulia calceola Verrill, an 
analogous Atlantic species. The reception, from the Fish Commis- 
sion, of specimens of C. calceo/a and of specimens of Corolla specta- 
dilis, with the shell, from the Santa Barbara Channel, California, 
leave no doubt of this. The soft parts of these two species also 
differ materially from those of Gleba, and CO. calceola has therefore 
been made by Dr. Pelseneer the type of a new group which he has 
named Cymbuliopsis (Challenger Pteropods, Thecosomata p. 100, fig. 
