140 EUG. DADAY DE DEÉS 
Claus, Esth. Newcombii Baird, Esth. californica Pack.), with 
fuller, more prominent, less oblique, and centrally situated 
beaks ; shell oblong oval, of à pale horn or amber color. Dorsal 
edge shorter than in E. mexicana, and in front of the beaks, 
instead of being straight and suddenly curved downward, is 
regularly rounder, much as in E. belfragei: posteriorly the 
dorsal edge slopes rapidis downward, without the well marked 
Fig. 26. — Caenestheriella Morsei (Pack) (sec. A.-S. Packard). — a, © caput a 
latere ; b, O telsonum et segmenta aliquot antecedentia ; ce, © pars apicalis pedum 
primi paris. 
angle of E. mexicana. Coarse punctures between the lines 
of growth, rather coarser than in E. mexicana, there being on 
an average 5-10 of these marking between the ribs in the center 
of the valve. Plate XXIV, fig. 7, also represents the markings 
at the edge of the shell ». 
« Second antennae, with a larger scape than in E. Belfragei, 
47 joints in the upper, 16 in the lower, flagellum. Legs of the 
male with a smaller lower division of the flagellum, and a 
smaller gill than in E. Belfragei, while the upper division or 
oviger is much shorter and broader than in any of the fore- 
going species, being no longer than the gill. The hand 1s appa- 
rently a little thicker than in E. Belfragei. » 
« Telson much as in E. mexicana, with about 20 pairs of 
teeth, coarser than in E. Belfragei, about 5 pairs of which are 
much larger than the others. » 
« Length, 12,2 mm. ; heigth, 8,2 mm.; thickness, 6 mm. » 
« Six specimens from Dubuque, Iowa, collected by Rev. 
A. D. Kendig. Six specimens from « Grindstone Creek, half 
