SPIRIALIS. 383 



time Dr. Philippi constituted his genus Sc^ica for a shell 

 very similar to the ^gean Peracle physoides. 



MM. Eydoux and Souleyet have described six species 

 of this genus, and of all these have examined the animals. 

 In all they found them furnished with a pair of elongated 

 swimmers, rounded and not bilobed at their extremities, 

 and an intermediate lobe of semicircular shape at the union 

 of which with the other two lobes the mouth, furnished with 

 two little labial elevations, is situated. The opening of the 

 vent was seen at the right side of the mantle ; the repro- 

 ductive organs were not clearly made out. We have 

 copied (in our Plate U, fig. 4) one of the figures of these 

 curious animals given in the Atlas to the voyage of the 

 Bonite, in the hope of directing the attention of British 

 naturalists, who may be so fortunate as to meet with living 

 individuals of our native species, to their generic pecu- 

 liarities."^'" 



" These Pteropods," say the authors cited, " are distri- 

 buted through all seas, and we have equally met them in 

 the Atlantic, the Indian, and the Pacific oceans, and in the 

 Chinese seas." 



Spirialis is evidently nearly allied to the old genus 

 Lwiacina. 



* In the plate this figure is given under the name of Peracle, a generic appel- 

 lation, which, for reasons stated above, must give way to Spirialis. We had 

 been misled by the date of the plates in the voyage of the Bonite. 



