KO.1210. SYNOPSIS OF NORTH AMERICAN TELLINIDjE—DALL. 309 



Macoma soUdula Pultene}", usuall}^ regarded as a variet}^ of halthica^ 

 has not })een found in that region. In addition to the sj^nonyms 

 mentioned in the Atlantic list, it wvaj be mentioned that the TeUlna 

 frigida of Krause, 1S85, is based on 3"0img halthica^ and it is possi- 

 ble that the original Tellina frhjlda of Hanley, 1844, was of the same 

 character. 



MACOMA YOLDIFORMIS Carpenter, 1864. 



Neah Bay, Juan de Fuca Strait, to San Diego, California. 

 A ver}' uniform, brilliantly polished species. 



MACOMA ALASKANA Dall, 1900. 



Litu3'a Ba}' and Sitka Harbor, Alaska, in 8 to 12 fathoms. 



A small species having the form of Moerella but the hinge of Macoma^ 

 with a polished greenish periostracum and the pallial sinus strikingly 

 discrepant in the two valves. 



MACOMA (CYMATOICA) UNDULATA Hanley, 1844. 



Gulf of California, south to St. Elena, West Colombia. 



3racomaoccidenfalisI)al\, 1889, not Tellinaoccidentalis Movch, 1861, 

 is s3'nonymous. This curious little shell is the Pacific analogue of the 

 Antillean Macoma arientalis Dall. 



MACOMA (REXITHAERUS) SECTA Conrad, 1837. 



Victoria, British Columbia, to the Gulf of California at Guaymas, 

 Mexico. 



This is perhaps the finest shell of the genus. Tell'ma ligamentina, 

 Deshayes, 1813, TelUnajaponica Deshayes, 1854, and Tellina denticu- 

 Jata Sowerby, 1867, not of Deshayes, 1854, are sj^nonynious. To the 

 somewhat ruder northern specimens Carpenter applied in a varietal 

 sense the manuscript Nuttallian name of eduh's, in 1864. 



'macoma (REXITHAERUS) INDENTATA Carpenter, 1866. 



Santa Barbara to San Diego, California. 



MACOMA (REXITHAERUS) INDENTATA var. TENUIROSTRIS Dall, 



1900. 



San Pedro and Santa Barbara Islands. 



This form difl'ers from the t3'^pical indentata in being more elon- 

 gated, with a shorter and more pointed posterior end and deeper flex- 

 ure. Tellina columhiensis Hanlej^, 1844, also belongs to this section 

 of the genus. 



MACOMA (PSAMMACOMA) ELONGATA Hanley, 1844. 



Lower California (lat. 30^ 36') south to Panama in 14 to 30 fathoms. 

 This species w^as confused by Carpenter in his labeling with Tellina 

 Candida auct., not Lamarck. 



