424 



with a much more finely coloured specimen in the hands of Mr. 

 Sowerby, sen., which fully confirms our description. The locality 

 is unknown. 



16. Spondylus imperialis (pi. 88. f. 43, 44.), Chenu, Illust. 

 conch, p. 6. pi. 26. f. 2, 3. 



S. testa regulari ovali, subdepressa ; area cardinali parva ; costis 

 principalibus 6, spinis distautibus elongatis, leviter arcuatis; in- 

 terstitiis costis tribus spinis acutissimis triserialibus ornatis. 



In this species, which grows much more freely than any other, 

 the point of attachment is scarcely perceptible, and the cardinal 

 area is very narrow. The shell is more depressed than S. regius. 

 The long spines on the six principal ribs are not so erect, nor the 

 interstitial ribs so numerous as in S. regius. There are three 

 between each principal rib, beautifully ornamented by spines 

 curved outwards. Towards the margin there is a row of smaller 

 spines on each side of the larger ones. The usual colour is red- 

 dish fawn between the ribs, and on the ends of the long spines, 

 while the six principal ribs are white. From China. The white 

 variety, fig. 43, is in the collection of Mr. Cuming. 



17. Spondylus armatus (pi. lxxxix. f. 53.), nobis. 



S. testa ovali, pallide fulva; costis principalibus quinque, spinis 

 rectis, longissimus, extantibus, interstitiis laevibus, aculeis parvis 

 in seriem dispositis. 



The description is taken from a single valve in the British 

 museum, having five slightly raised ribs, with three or four very 

 long straight spines on each, some of which exceed the shell in 

 length. Between the ribs there are a few very small spines. The 

 rest of the shell is smooth. 



18. Spondylus regius (pi. lxxxvii. f. 30.), Gmel. no. 2. 



S. testa regulari, ovali ; area cardinali parva ; costis 6 principa- 

 libus, hnbricatis ; spinis elongatis, distantibus, erectis, ad terminos 

 subcomplanatis ; interstitiis costis numerosis, imbricatis. 



This species generally grows freely, and is consequently regular 

 in form, and has a small cardinal area. The six principal ribs are 

 each armed with five or six long, straight spines, which are slightly 

 flattened at the termination. The interstices have numerous 

 sharply imbricated smooth ribs. The colour is of a reddish-brown 

 between the ribs, and on the points of the spines ; a white variety 

 is represented in Chenu's ' Illust. conch/ 



From the Sooloo Islands, H. Cuming- 



