CLASS PELECYPODA 
11 
Type in U. S. N. M. No. 110679. Type locality, U. S. S. Albatross 
station 2799, Panama Bay, in 29 fathoms. 
Range. Santa Barbara, California, to Panama. 
Solemya valvulus Carpenter, 1864. 
Plate 40, fig. 10. 
Ann. and Mag. Nat. History, (3) 13:312. 
S. testa minore, tenuissima, diaphana, vix testacea, cornea, pallidiore, 
lineis tenuibus, distantibus, fuscis, radiatum ornata; postice tenuiter 
radiatim striata; tumente, satis elongata, marginibus antico et postico 
regulariter excurvatis; umbonibus vix conspicuis; lineis anticis divari- 
cantibus, extus parentibus, intus lacunam cartilagineam definientibus; 
cardine edentulo; ligamento, antice curto, latiore bifurcato; cicatricubus 
adductorum subrotundatis. (Carpenter.) 
Shell small, thin, transparent, scarcely or hardly shelly, pale horn 
color, ornamented radially with slender distant brownish lines; finely 
striate radially in the rear; tumid, somewhat elongate, with markings in 
front and rear regularly curved; with inconspicuous umbones; with lines 
branching anteriorly, purple outside and inside, defining the cartilage pit; 
with edentulous hinge; with ligament elongate to the rear, anteriorly 
short broad bifurcate; adductor scars subrotundate. (A free translation.) 
Length, 85; height, 25 mm. 
Type in U. S. N. M. Type locality, Cape San Lucas, Lower Cali¬ 
fornia. 
Range. San Pedro, California, to the Gulf of California. 
Family NUCULID^. 
Genus NUCULA Lamarck, 1799. 
Shell trigonal, with the umbones turned toward the short posterior 
side; smooth or sculptured, epidermis olive, interior pearly, margins 
crenulated; hinge with prominent internal cartilage pit, and a series of 
sharp teeth on each side; pallial line simple. (Tryon. S. S. Conch.) 
Type. Nucula obliqua Lamarck. 
Distribution. Northern and Arctic seas; Siberia, Melville Is., New 
England, Britain, Mediterranean, Cape, Japan, Australia. 
Range in time. Palaeozoic, Trias, Cretaceous and Tertiary. 
Nucula quirica Dali, 1916. 
Proc. U. S. N. M., 52:394. 
Shell small, dark olive inclining to black, polished, with rather rude 
irregular incremental lines; rounded triangular, the anterior end very 
