NO. 1185. SYNOPSIS OF THE SOLENID^— BALL. 109 



Genus SILIQUA Megerle. 



1. Siliqua lucida Conrad, 1838; Mouterey to San Diego, California. 

 Confounded with the young of 8. nuttallii by Carpenter, 1863, and 



Gabb, 1868; also, according to Conrad, with 8. radiata Linnaeus. 



2. Siliqua media Gray, 1839; Okhotsk and Bering seas and north- 

 ward to the Arctic Ocean at Cape Lisburne. 



Machwra costata Middendorf, 1851, not Say, 1822; + S. borealis Con- 

 rad, 1867, not Oultellus medius Sowerby, Conch. Icon., 1874, = S. squama 

 Blainville. 



3. Siliqua patula Dixon, 1788,-Okhotsk Sea; the southern border of 

 Bering Sea, and the Gulf of Alaska to Sitka. 



Described from Cooks Inlet, Alaska. The following names are 

 synonyms: Solen maximus Wood, 1815, not Gmelin, 1792; S. gigas 

 Dillwyn, 1817; S. grandis (Hinds Mauusci-ipt as of Gmelin) Duuker, 

 1861, and Carpenter, 1863 ; *S^. splendens Chenu, 1845 and 1862. Large; 

 with submedian beaks and straight rib. The following are discrimina- 

 ble varieties, but apparently connected by gradations with the typical 

 ^S*. patula. 



4. Siliqua {patula var.) alta Broderip and Sowerby, 1829; Bering Sea 

 and Strait. 



This is figured under the name of Gultellus costatus by Sowerby, 

 Conch. Icon., 1874, but is not the costatus of Say. It is short and broad 

 with very anterior beaks and straight rib. 



5. Siliqua {patula var.) nuttallii Conrad, 1838, Lituya Bay, Alaska, 

 south to Oregon, and California as far as Monterey. 



S. americana Chenu, 1845, may be the same, but I do not know it; 

 S. californica Conrad, 1868, and S. nuttali Sowerby, 1874, are synony- 

 mous. The shell is very straight, brilliantly polished, narrower than 

 the typical S. patula and with a much more oblique rib. The beaks 

 are less anterior than in S. alta. 



NOTES. 



Solen tenuis Broderip and Sowerby, 1829, is unidentifiable, from the 

 absence of a figure and the excessive brevity of the description. It is 

 not the S. tenuis Gray, in Griffith's Cuvier, 1833. It was collected by 

 Belcher, whose shells came mostly from northwest America. 



Solen '^ lineatus Spengler," appears in Morch's Catalogue of Poulseu's 

 West India shells. It is probably intended for S. linearis Spengler (in 

 Chemnitz) and may have been based on a misideutified specimen of 

 Ensis 7ninor. 



Solen niveus Hanley is listed by Guppy in his Paria fauna, 1877, and 

 was perhaps based on a young specimen of S. obliqims Spengler, or the 

 following species: 



Solen lappeanus Dunker, Moll. Marina, 1858, is said to be from the 

 Antilles, but has not been reported from that region by anyone else. 

 Externally it is not unlike S. viridis Say. 



