38 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.54. 



NUCULITES SPECIOSUS. new species. 



Plate 12, figs. 9, 18, 19. 



Shell thin, large, elongate, subcylindrical,^ length nearly three 

 times the height. Hinge line long, crenulate. Posterior end cune- 

 ate. Front rounded, clavicle in type-specimen strong but thin and 

 inclining forward; in a second specimen (M 1809) inclining backward. 

 Beak low, in the mold of interior scarcely projecting beyond hinge, 

 terminating about one-fourth of length back of front margin. Pos- 

 terior end prominently corrugated, apparently in part due to pucker- 

 ing of the shell by pressure. 



The dimensions of the largest specimen are: Length 43, and height 

 15 mm. (pi. 12, fig. 19); another specimen from the same locality 

 (M. 1807) measures 40 by 14 mm. Two other specimens from same 

 locality, probably the same species, measure 33 by 13 mm., and 32 

 by 13 mm. (M. 1806, see pi. 12, fig. 9, and M. 2081). 



Another specimen, from another outcrop of probably the same 

 horizon (M. 1809, see pi. 12, fig. 18) has an estimated length 42, 

 estimated height 14 mm. 



In size and general form it resembles N. crassus, but differs from 

 that species in its thin shell, inconspicuous beak, slender clavicle and 

 absence of trace of muscular impressions. 



In these latter characters, it approaches N. corrugatus; but it is 

 longer, thicker, not so flat, and the extremities, both anterior and 

 posterior, are lengthened and more attenuate than in N. corrugatus. 



These differences from N. corrugatus may, in part, be accounted 

 for by the slaty deformation of the rock in which they are contained. 

 The rock contaming the types of N. corrugatus is a similar shale, but 

 does not show the splintery structure of the shale holding N. specio- 

 sus, and it is to be noted that aU of the specimens referred to N. specio- 

 sus have their long axis in line with the long axis of the spUnters. 



The only specimen associated with them, lying crosswise to the 

 direction of slaty elongation, is abnormally short (see N. ahnormis, 

 pL 11, fig. 16). 



Formation and locality, — ^Pembroke formation, gray shale on the 

 west side of Coffin Neck, opposite Gooseberry Island, Lubec Town- 

 ship (loc. No. 5.44.2 A). These beds rest immediately upon some 

 light greenish shales holding an unmistakable Edmunds fauna. 



Remarlcs. — This species has been found in other outcrops of the 

 shales near the border between the Edmunds and Pembroke forma- 

 tions, at the northern end of Coffin Neck (loc. No. 5.34.7 A^), and in the 

 collection made by N. S. Shaler in Straights Bay, precise locality not 

 known (loc. No. 1443 D 7) , probably the same as locahty No. 5.33.8 B. 



Type-specimen.—Cnt. Nos. 62878, 62880, U.S.N.M. 



1 A specimen (M 2013) from the collection made by N. S. Shaler (loc. 1443 D 7), probably the same locality 

 as our 5.33.8 B, presents apparently the characters of this species tmdistorted— the snbcylindrical form of 

 I he types is supposed to have been produced by pressure (see M 1805, N. abnormis). 



