950 PROCEEDINGS OF THE NATIONAL MUSEUM. ■ vouxxvi. 



were much eroded), is often obsolete, its beaks nearly anterior, its 

 hingo broad, its margin with embrasure-like flutings, and it frequently 

 has the disk tinged inside with a flush of livid purple-brown. I have 

 in my Synopsis of the Carditacea called this Yenericardia ritdis, but I 

 aiu now almost convinced that it is the present shell and should take 

 the name of IT erassldens. It has the very markedl}^ l)road hinge and 

 large, more or less sulcate cardinals called for b}^ the description, and 

 one of the specimens in the National Museum comes within 2 millime- 

 ters of the required dimensions. Mr. Smith has referred this to 

 Astarte castanea, but A. castanea does not occur in that region, and 

 has (juite small though very distinct crenations, which have not the 

 square form recalling embrasures like those of Yenericardia. Nor 

 does A. castanea., as far as known, reach a size comparable with that 

 mentioned for A. crassidens. All the other Astartes known from the 

 region where Icy Cape is situated which are large enough to till the 

 requirements of the diagnosis of Broderip and Sowerby have very 

 white shells and perfectly smooth margins. There is onl}^ one crenate 

 species there, and it is quite small in comparison and has quite minute 

 crenulations. 



The European species which do not appear in the Western Hemis- 

 phere are A.starte Hulcata Da Costa, A. incrassafa Brocchi (frequently 

 called A. fasca Poll), A. crel/ricostata Forbes, A. compressa Montagu, 

 A. pusin<i Forbes, A. ^wrvrt Searles Wood, ^1. (Gonilia) calVKjona, Dall 

 (/l. hipai'tita Philippi non Sowerby), A. {Digitaria) digifarla Linn<eus, 

 Goodallia triangularis Montagu, and G. macandrewi Smith. Astarte 

 triquetra Conrad is a Parastarte and belongs in the Yeneridse; A. fia- 

 hella Conrad, is a Yenericardia., and ^4. jiactnata Carpenter, is the 

 nepionic young of Crassatellites sp. 



Since the figures of the new species do not wholly till the plates, the 

 figures of some recently described ])ut yet untigured species are 

 included with those of the Astartidge, wdth references to the place of 

 publication. 



EXPLANATION OF PLATES. 

 Plate LXII. 



Fig. L Crania palagonica Dall, upper valve, diameter 8.5 mm.; Proc. U. S. Nat. 

 Museum, XXIV, 1902, p. 562; Straits of Magellan, U. S. N. M., No. 96913. 



2. Crassatcllitex brasiUenxis Dall, from off Rio de .Janeiro in 59 fathoms; Ion. 37 



mm.; U. S. N. M., No. 96104; The Nautilas, XVI, p. 101, 1903. 



3. Crania patayonira Dall, inner face of upper valve showing nui.scular 



impressions. 



4. Crenella mega.s Dall, height 25 mm.; I'roc. IT. S. Nat. INIus., XXIV, 1902, p. 



559; Panama Bay, in 33 fathoms; U. S. N. M., No. 96256. 



5. Echimjchanta callformca Dall. new species, from off Cerros Island, l^ower Cal- 



ifornia, in 25 fathoms; length e.xdusive of tiie spines, 40 mm.; V. S. N. M., 

 No. 96452. The coloration is vellowish white. 



