86 THE NAUTILUS. 



The animal was alive when captured, and was brought up from a 

 depth of about 42 fathoms, bottom temperature about 51° Fahr. 

 I have not been able to compare it with the C. Krebsi Mdrch of the 

 Antilles, which is said to have a short spire. 



The discovery of this species adds another to the list of Mediter- 

 ranean forms which reappear either directly or by closely related 

 varieties or species, on the Pacific coast, attention to which had been 

 called already by the late Dr. Philip Carpenter. Among them are : 



California. Mediterranean. 



Cymatium var. tremperi, C. corrugatum, 



Leptothyra carpenteri, L. sanguinea, 



Gibbula canfieldi, G. adriatica, 



Williamia peltoides, W. gussoni, 



Arctonchis borealis, A. celtica, 



Leda cuneata, L. cuneata, 



Crenella decussata, C. decussata, 



Verticordia novemcostata, V. novemcostata, 



Lima orientalis, L. tenera, 



Zirphsea crispata, Z. crispata, 



Platidia anomioides, P. anomioides. 



To these many more might be added without stretching the com- 

 parisons unduly. 



A NEW MEXICAN MUSSEL, LAMPSILIS FIMBEIATA. 



BY L. S. FRIERSON. 



Lampsilis fimbriata, n. sp. 



Shell large, elliptical, thin, and compressed. Dorsal line incurved 

 in front of the beaks. Anterior margin somewhat obtruded, and 

 obtusely pointed or sharply elliptically curved. Basal margin nearly 

 straight, occasionally slightly arcuated. Posterior margin broadly 

 roundly biangular. Beaks low, and without sculpture. Posterior 

 ridge elevated, rounded and obsolete. The greatest diameter of 

 the shell being about the center of the ridge. Sides flattened, and 

 generally somewhat constricted in the middle. Behind the posterior 

 ridge, down the siphonal area extends a raised line, enclosing a tri- 

 angular area (having its apex at the beak) which is sculptured 



