THE MOLLUSCA Or TOBEES STRAITS. 187 



318. PECTU]!fCTJLUS HOTLEI, sp. n. (PL 11. fig. 24.) . 



P. testa orbiculari, sequilaterali sequivalvi, solidiuscula, um- 

 bonibus prominulis, approximatis, dorsaliter recta, ad latera 

 utrinque bis rufomaculata, radiatim fortiter costata, costis ad 

 octo et viginti, uniformibus, pulchre nodoso-squamatis, nodulis 

 interdum superficiem apud mediam evanidis, interstitiis trans- 

 versim squamato-liratis ; cardine dentibus ad viginti in valva 

 utraque instructo, albis, simplicibus ; pagina intus albescente, ad 

 latera interdum roseo-tincta. Alt. 24, lat. 25, diam. 15 mm. 

 (spec. max.). 



Station 2, Warrior Island ; Station 5, Boydong Cays. 



Superficially this interesting new form approaches P. nodosus, 

 Eeeve, a rare Ceylonese species, in which the ribs are of the 

 same character, but bolder, wider in proportion, and consequently 

 much, fewer numerically, being only eighteen as against twenty- 

 eight in P. Soylei. The coloration also is more varied in the 

 Ceylonese shell. Our species is almost colourless, being whitish, 

 tinged here and there with faint red streaks, and conspicuously 

 twice-blotched with red maculations both posteriorly and an- 

 teriorly. The surface is thickly ribbed, the ribs being beautifully 

 scaly-nodulous, the interstices between them being also squaraoso- 

 lirate. The teeth of the hinge in either valve are some twenty 

 in number, simple. Interior whitish, tinged in most specimens 

 laterally with faint rose-colour. 



We dedicate this Pectunculus to Mr. William Evans Hoyle, 

 Director of the Manchester Museum, as a small recognition of 

 many kindnesses experienced at his hands. 



319. Pectunculus viteeus, Lam. 



This, the flattest and most placunoid of all Pectunculi, was, at 

 the time of its discovery, one of the rarest of Mollusca, and 

 for many years was only known by one valve, brought home by 

 the voyageur M. Peron, and deposited in the Musee Eoyale, 

 Paris. Prof. Haddon dredged about a dozen specimens, one of 

 them being alive and perfect, though young. This shows 

 orange-brown flecking and pure white interior. It has occurred 

 at Mauritius and one or two other places in the Eastern tropics, 

 and this is an interesting extension of its range. 



Station 5, Boydong Cajs ; Station 10, between Hammond 

 Island and Wednesday Spit. 



lAWa. JOUEjST. — ZOOLOaT, YOL. XXVII. 14 



