64 ZOOLOGY OF THE VOYAGE OF THE SULPHUR. 



262. Nucula lata, Hinds, 1. c. p. 99, (Plate XVIII. fig. 10.) Testa oblonga, polita, planulata, 

 lineis impressis excavata; antice elongata, late rostrata, postice rotundata; margine dorsali autico 

 prorninulo ; umbonibus parvis. 



Inhab. New Guinea. In from five to twenty-three fathoms, among mud. 



263. Nucula calata, Hinds, 1. c. p. 99, (Plate XVIII. fig. 13.) Testa luteo-virente, oblonga, 

 argute sulcata; antice arcuate rostrata, sulcis paululum obliteratis ; umbonibus prominulis. 



Inhab. California, between 38° 18' and 34° 24' north latitude; namely, at 

 Russian Bodegas, San Francisco, and Santa Barbara. In from six to ten 

 fathoms. 



More ventricose and acutely beaked than N. pella, and presenting a partial 

 obliteration of the sulci near the anterior dorsal margin. 



264. Nucula ventricosa, Hinds, i. c. p. 100, (Plate XVIII. fig. 16.) Testa, oblonga, pallide 

 lutea, ventricosa., sulcata; antice subrecte rostrata; umbonibus magnis, prominentibus ; margine 

 ventrali antice coarctato. 



Inhab. Straits of Malacca. From seventeen fathoms, mud. 



The character of the sulcation is very different to that of the preceding 

 species and of N. pella. Here it presents the most usual features of regular fur- 

 rows with intervening ridges ; but in the other two species the ridges are inclined 

 planes, having an inclination towards the ventral margin. In this direction they 

 consequently present a number of step-like elevations, but not in the contrary. 



265. Nucula recta, Hinds, 1. c. p. 100, (Plate XVIII. fig. 15.) Testa oblonga, tumida, 

 inclinate sulcata, recte et attenuate rostrata, postice rotundata.. 



Inhab. New Guinea. In seven fathoms. 



266. Nucula excavata, Hinds, 1. c. p. 100, (Plate XVIII. fig. 17.) Testa globosa, sulcata, 

 gibbose rostrata, antice carinata; lunula excavata, ovali, striata. 



Inhab. Panama. Dredged among mud in thirty fathoms. 



267. Nucula lyrata, Hinds, 1. c. p. 100, (Plate XVIII. fig. 12.) Testa oblonga, nitida, angu- 

 late sulcata, acute subrecte rostrata, postice elongata, rotundata; margine ventrali acuto integro. 



Inhab. Panama. From thirty fathoms. 



268. Nucula puellata, Hinds, 1. c. p. 100, (Plate XVIII. fig. 18.) Testa oblonga, nitida, 

 lseviter striata, antice breviter arcuate rostrata, postice rotundata ; prope umbones turgida. 



Inhab. Malacca. From ten to seventeen fathoms, coarse sand. 



269. Nucula crispa, Hinds, 1. c. p. 100, (Plate XVIII. fig. 14.) Test& oblonga, turgida, sul- 

 cata., arcuate rostrata, antice ab umbonibus exarata, postice obtuse carinata ; lunula ovali. 



Inhab. Gulf of Nicoya. From thirty-six fathoms. 



