18 



BULLETIN 93, UNITED STATES NATIONAL MUSEUM, 



Terminal or caudal apyeridages. — These are very long in V. stromia, 

 V. spengleri, V. Isevigata, and V. nexa, described by Darwin, and in 

 V. alba and V. Jiorldana, being over lialf the length of cirrus vi, and 

 more than double the length of its protopod. They are shorter 

 though still rather long in V. entohapta and V. calotheca fiavidula. 

 The other species examined by me have short caudal appendages, 

 not much exceeding the length of the protopod of cirrus vi, or even 

 shorter. The actual and relative length follows: 



Species. 



V. alba 



V. alba 



V. floridana 



V. cntobapta 



V. c. fiavidula. . 



V. calotheca 



V. c. heteropoma 



V. xanthia 



V. darwini , 



V. hoeki 



V. bicornuta 



V. euglypta 



V. halotheca 



Caudal appendages. 



Length in 

 mm. 



2.8 



2.5 



3.2 



2.4 



2.3 



1.8 



1.6 



1 



1.9 



0.6 



2.6 



2 



2 



Number of 

 segments. 



Protopo- 

 dite of cii'- 



riis V 



(length in 



mm.). 



Cirrus vi 



(length in 



mm.). 



Distribution of Verruca. — Under this head it may be said that 

 while the genus is of almost world-wide occurrence, there are some 

 extensive areas where no species have yet been found. In the 

 Pacific no Verruca is known to exist on the west coast of America 

 from Peru to the Arctic Ocean. Southward along the Asiatic coasts 

 we encounter the genus first in the Philippine Archipelago. TJie 

 whole North Pacific is therefore without species. One, the largest of 

 the genus, is found, however, in the Hawaiian Archipelago. The 

 coasts of tropical and South Africa have as yet afforded no Verrucidse, 

 and none are known from Australian seas; yet these coasts have not 

 been very closely explored in deep water, near and off the borders of 

 the continental shelf, where these animals have elsewhere been found 

 most frequently. 



In the north one species, V. stromia, has been reported from Ice- 

 land, and in the Antarctic Ocean V. mitra was taken by the Belgica 

 in 70° south latitude. Only three species, V. stromia and V. spengleri 

 of Europe, and V. laevigata of western South America, live in shallow 

 vwater. All of the others are truly deep-sea creatures. 



Dr. P. P. C. Hoek, in his account of the Belgica cirripedia (1907) 

 has given a list of 25 recent species, grouped by geographic provinces. 

 Adding to this list the new species described from the Indian Ocean 

 by Professor Gruvel, and the American species described by myself, 

 we have the following result; 



