40 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



tergum has also a partition like that of the rostrum (fig. 2a, interior 

 of the movable and fixed scuta and terga, the carina and rostrum 

 removed). 



Cirrus i has equal rami of 17 joints. Cirrus ii has very unequal 

 rami of 9 and 18 segments, the shorter rarnus obtuse at the tip, 

 densely hairy; longer ramus with mainly three pairs of spines on 

 each segment. Cirrus iii has subequal rami, the anterior ramus 

 with four or five pairs of spines, the posterior with three pairs on 

 each segment. 



The terminal appendages are very small, shorter than the adjacent 

 protopods, being about 1.6 mm. long, composed of 11 profusely bristly 

 segments (pi. 9, fig. 3). 



Penis 1.3 mm. long. 



These additions to the description given in my previous paper are 

 made for the reason that the structure of the interior is peculiar. 

 V. stromia when immature, and sometimes in the adult stage, resem- 

 bles V. euglypta by having the fixed scutum and tergum vaulted; 

 also, to a less extent, by having the rostrum hollowed out above. 

 In most other respects the two species are widely diverse. 



Section D: ALTIVERRUCA. 



Form erect, the movable plates very steeply sloping or erect; basal 

 edges of the wall not inflexed, often having a narrow, hemlike border 

 within; fixed scutum with no adductor pit or ridge; no internal 

 partitions; paries of fixed tergum narrow; alse very wide. Caudal 

 appendages are very short. 



Type. Verruca lioeki. 



This group, which is quite distinct by its erect posture, wide alse of 

 the fixed scutotergal wall, and weak development of the articular 

 ribs, comprises most of the species known from very deep and cold 

 water. 



The following forms belong here : 



NORTH ATLANTIC SPECIES. 1 



V. dbligua Hoek, off southwestern Spain. 

 V. longicarinata Gruvel, Sargasso Sea. 

 V. Tioeki Pilsbry, West Indies, 491 fathoms. 

 V. erecta Gruvel, off Azores. 

 V. radiata Gruvel, off Canaries, 912 meters. 

 V. licornuta Pilsbry, western Atlantic. 

 V. ratJibuniana Pilsbry, western Atlantic. 

 V. darwini Pilsbry, western Atlantic. 



1 Verruca sculpta, crcnata, incrmis, and cornuta of Aurivillius probably belong to this section also. They 

 have not been figured, and the internal structure is unknown. 



