REPORT ON THE LAJVIELLI BRAN t;HI ATA. 251 



Pectuncuhis formosus, Reeve. 



Pedunculus fonnoms, Reeve, Conch. Icon., vol. i. pi. viii. fig. 48i. 

 Habitat. — St. Vincent, Ca])e Verde Islands, in 7 to 20 fathoms. 



The figure 48a of Reeve seems to represent a distinct species. The shells from the 

 above locality, which I have identified as Pectunculus formosvs, are very little more 

 than an inch in length. They are of a whitish ground colour, and variegated with a 

 considerable amount of interrupted purplish-red rays as depicted by Reeve. The 

 sculpture consists of concentric lines of growth, which at the sides become a little 

 raised. A thinnish epidermis covers portions of the surface, more especially near the 

 outer margin. It is finely concentrically lamellated and radiately ciliated, and when 

 removed the surface exhibits more or less clearly punctured lines which indicate the 

 position of the cilia. The umbones appear to be invariably white, and the hinge-plate 

 is blotched within on each side with purple-brown or red. The teeth are arranged in 

 an uninteiiupted arcuate series, and are about twenty to twenty-four in number. The 

 interior of the valves is for the most part white, and the outer margin is finely 

 denticulate. 



This species is very closely allied to Pectunculus stellatiis, and, indeed, may 

 eventually prove to be a variety of it, differing somewhat in the style of its colouring 

 and the epidermis. 



Pectunculus holosericiis, Reeve. 



Pectunculus holose/iciis, Reeve, Conch. Icon., vol i. ]il. iv. fig. 18. 

 Pectunculus holosericus, Reeve, Proc. Zool. Soc. LoncL, 1843, p. 34. 

 Axinia holosericus, Angas, Proc. ZooL Soc. Lond., 1867, p. 932. 



Habitat. — Port Jackson, in 2 to 10 fathoms (Challenger); Broken Bay, New South 

 Wales (Brit. Mus.) ; Watson's Bay (Angas). 



On the soft velvety epidermis being removed, the entire surfoce of this species is 

 minutely reticulated with radiating and concentric striae. The t;olour is usually light 

 brownish-white, generally variegated at the beaks with a few pale brownish-red zig-zag 

 markings. The interior is at times totally white, but frequently more or less stained 

 towards the pallia! line o)i one side with a rich purple-brown tint. 



? Pectunculus strlatularis, n. sp., (Lamarck ?) Reeve. 



Pectunculus striatulnris, (Lamarck) Reeve, Conch. Icon., vol. i. pi. vi. fig. 27. 



Habitat. — Port Jackson, New South Wales, in 6 to 7 fnthoms : and Station 212. 

 south of the Philippine Islands, iu 10 fathoms. 



