THE MOUNT DESERT EEGION 237 



Limb 5 — 15.9, 10, 6.2, 5, claw omitted 

 Limb 6 — 16.6, 10, 5.9, 5.2, claw 10. 

 Limb 7 — 11.9, 10, 4.3, 4.3, claw 8.5. 



The proximal apophysis of the penis is small and bent 

 almost into a semicircle, the middle one is strongly bent at 

 the tip and expanded somewhat at the point of curvature. It 

 is noteworthy that these two apophyses are curved in oppo- 

 site directions. Unlike the species discussed by Sars, the 

 terminal apophysis is small, blunt, and lacks the proximally 

 directed limb, or perhaps this limb is fused to the base of the 

 middle apophysis. 



The female closely resembles the male in the structure of 

 the appendages, but the shell is more compact, that is, rela- 

 tively higher and broader. The proportions are : length, 100 ; 

 width, 40; height, 51. 



This species may be distinguished from other northern 

 members of the genus by the proportions and sculpturing of 

 the shell, the relatively great length of the fourth segment 

 of the first antenna, and the structure of the penis. 



The shell of this form bears a strikingly resemblance to 

 Cythere canadensis as figured by Brady and Norman, but 

 not to the figures originally given by Brady. 



We have taken this species on soft bottoms, in 10 to 70 

 feet of water, at Stations D 35, 46, 59, 76; P lOB. 



L. CASTANEA (G. 0. Sars). (G. 0. Sars, 1925, p. 174, pi. 80, 

 fig. 1.) Taken once on sand bottom in 6 feet of water at S 21. 

 The species is new to New England. 



Palmenella Hirschmann 

 P. AMERICANA Blakc. (Blake, 1929, p. 12, fig. 5.) Taken 

 on muddy bottoms in 30 to 40 feet of water. Stations : D 35 ; 

 PIOB. 



Cythereis Jones 



The classification and delimitation of this genus is still in 

 a most unsatisfactory state. It is a large genus (more than 

 120 recent species are known with some certainty) which, as is 

 often the case in large genera, exhibits complex interrelation- 



