APPKNDIX. 341 



todon, Heniochus, Amphacanthus, Theutis, and Fin- 

 tularia* 



Of Crustacea we saw twenty different kinds ; 

 among them a Gonoplax of the middling size, and 

 as white as the coral-sand, among which it lives, 

 on the shore. The Hippopus found here differs 

 from the maculatus already known by the much 

 greater elevation of its shell. The large Tridachna 

 is the Tr. squamosa Lam. It is very unusual to 

 meet with an animal belonging to the family of 

 Lepades in tubular holes made in the coral rocks, 

 as is the case with the Lithonaetta N. Among 

 the twenty kinds of tabular coral here observed, 

 there was not one of those collected at O Tahaiti ; 

 there were three new Distichoporct, Scriatipora, six 

 kinds of Madrepora, two Forties, four Astrea, Pocil- 

 lopora ccerulea, and another kind, forming broad, 

 yellow, leafy masses, the slime of which stings like 

 a nettle ; Cariophyllcea glabrescens Cham., and Tubi- 

 pora, with red animalculae. 



A calm of several days, between eighteen and 

 twenty degrees of north latitude, during our pas 

 sage to Kamtschatka, afforded opportunities for the 

 observation of several remarkable animals. A small 

 animal of Lamarck s family of Heteropodes, with two 

 rows of separate fins, received the name Tomopteris. 

 Secondly, a Salpa, of the class which Jives apart 

 and has fine long fibres projecting from the hinder 

 part of the body. Thirdly, a small animal, nearly 

 allied to the Diphyes, the soft part of the body, 



