272 REPORT ON ALBATROSS MOLLUSCA DALL. 



its inner part. Adult, maximum longitude 40, altitude 32, diameter 

 26, vertical from the beaks behind the anterior end 10 ; young, maxi- 

 mum longitude 14.5, altitude 11.5, diameter 7.5, vertical 4.5 mm . 



Hab. — Station 2402, between the Mississippi delta and Cedar Keys, 

 in 111 fathoms, muddy bottom; stations 2604 and 2606, off Cape Hat- 

 teras, North Carolina, in 25 to 34 fathoms, sand; west of Florida, in 

 50 fathoms (U. S. S. Bache); station 2640 and 2646, off the southern 

 part of Florida, in 56 to 85 fathoms, sand; and station 2758, 90 miles 

 southeast from Cape San Roque, Brazil, in 20 fathoms, shelly bottom ; 

 temperatures 77° to 79°.l F. 



This remarkably elegant species has about the form of Dione Kingi 

 Gray as figured by Reeve (Couch. Icon. Dione, PI. ix, Fig. 36a) with 

 somewhat the sculpture of D. grata and D. erycina. It recalls in its 

 coloration Tapes turgida Lamarck and T. lirata Philippi, minus their 

 dark radiating bands. It is like none other on the east coast of Amer- 

 ica and has been for several years recognized by me as undescribed, 

 from the specimens in the National Collection. 



Subgenus CALLISTA (Poli) Morch. 

 Callista maculata Linue. 



This species was collected at Station 2758. 



Suborder TELLINACEA. 



Family TELLINID,^. 



Geuus MACOMA Leach. 



Subgenus CYMATOICA Dall. 



Shell telliniform, without lateral teeth, with two small grooved car- 

 dinal teeth in the right valve, one in the left valve, and no laterals; 

 with the external surface covered with wavy sculpture not in harmony 

 with the direction of the incremental lines; with the anterior portion of 

 the shell longest, the posterior strongly flexed, and with the pallial 

 sinus deep but free from the anterior adductor scar in both valves. 



Cymatoica occidentalis sp. nov. 

 Plate x, Fig. 11. 



Shell small, thin, white, moderately full in front, compressed and 

 strongly twisted to the right, behind; anterior part of the shell the 

 longer, sloping from the beaks, gently rounded toward the base; beaks 

 small, pointed, not inflated; posterior portion of the valves rapidly at- 

 tenuated, compressed, rostrated and somewhat obliquely truncated ; 

 sculpture of small, narrow, rounded, nearly equidistant waves, not in 

 harmony with the incremental lines and showing in different specimens 

 slight differences of prominence and direction ; in general they have a 

 longitudinal direction, rising as they pass backward ; those near the 



