PROCEEDINGS OF THE NATIONAL MUSEUM. \ 73 



oiis nodes are spotted above and below, and there are revolving 

 bands of the same color, especially seen on the basal volntion. 



PLEUROTOMA (DRILLIA) INCRASSATA, Sowerby. 

 = D. Botta; Val., Tryon. 



One example from each locality. 



Mazatlan, Henry Edwards; San Lncas Cove, Fisher (Fo. 55252, U. 8. 

 K M.). 



The Mazatlan example was collected and presented to the writer by 

 his esteemed friend, the late Henry Edwards, so well known as an 

 excellent entomoloji'ist and actor. 



(His mafi'nificent collection of insects has recently become the])roperty 

 of the American Museum of Natural History, New York.) 



PLEUROTOMA (DRILLIA) MAURA, Sow.-iby. 



Several specimens. 



San Lneas Cove, dredjSfed oft" San Marcos Island (No. 55237, U. S. 

 N. M.). 



Five examples, imperfect an<l dead, were obtained by dredging at 

 this place. The largest measures 2.50 long., lat., .63, aperture 1.16 

 inches; the others, withontmaking allowance fortheerosion of the apex, 

 measure, respectively, 2.00, 2.06, 1.94, and 1.84 long, inches. A com- 

 parison of the specimens shows that they run quite closely in sculpture, 

 varying but little; in color they range, as do several of the related 

 forms, from dark chocolate to a yellowish or sienna- brown. The late 

 Mr. Tryon kindly compared the above with the specimens in the 

 Philadelphia Academy's collection, and returned the following note: 



"PI. maura, Sowb. Reeve, sp. 47, 'Isle of La Plata;' and exactly like 

 a specimen in our museum received from Sowerby." 



Worn specimens sometimes exhibit a whitish line following the suture, 

 on the upper whorls and Just below the knobs on the body whorl, lleeve 

 gives a figure of this species in his Conchologla Systematica, but the fine 

 sculpture shown in said figure is not so clearly exhibited in heavy adult 

 specimens. 



Family Cancbllariid^. 



CANCELLARIA (APHERA) TESSELLATA. Sow.rhy. 



Several examples. La Paz Harbor, on a small island (No. 46273, II. 

 S.N.M.). 



Many specimens of this rare and peculiar form were obtained as 

 above indicated by Mr. Fisher. The figure No. 1841 in Chenu's Mantial, 

 Vol. I, is apparently drawn from a young specimen. 



Family O L I V I D ^ . 

 ( »LIVA VENULATA, Lamarck. 



Numerous examples. 



(Nos. 32401, 32402, 32416, 32431, U. S. N. M.) La I'az; Los Animas 



