THE NAUTILUS. ol 



luost obviously new or interestiut^ forms were made the subjects of 

 Lrief 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, j)p. 

 137-8), nnder the name of Coro/la 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 preseivaiion. 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 

 I became convinced that these animals were more related to Tied- 

 viannia 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 fiicility. The genus Gleha Forskiil was 

 similarly descril)ed 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 Paul Pelseneer received from me copies of all my unpublished 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 inaccess- 

 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 whic-h 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. calceola and of specimens of Corolla specta- 

 bilis, 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 C. calceola has therefore 

 been made by Dr. Pelseneer the type of a new group which he has 

 named Cymbuliopsis (ChaWeuger Ftero^ods, Thecosomata p. 100, fig. 



