THE BARNACLES IN THE U. S. NATIONAL MUSEUM. 67 



SCALPELLUM AURIVILLII INCERTUM, new subspecies. 



A single example (Cat, No. 32871, U.S.N.M.), evidently very closely 

 related to S. aurlvilUi^ was found growino- on the peduncle of one of 

 a series of S. regiuni var., said to be from Alhatrosx Station 3342, off 

 British Columbia, in 1,588 fathoms. Having been preserved probably 

 in formaldekj^de, the apices of the valves are more or less eroded, 

 especially those of the terga. Allowing for this the length of the 

 capitulum would be 24, breadth 13.5 mm.; length of the peduncle 7.5 

 mm. Length of the carina 22, diameter at base 3 mm. The plates 

 are pale cream-colored, smoothish, except for narrow, widely spaced 

 growth-arrest marks. On the roof of the carina the growth lines arch 

 downwards. The upper latus is larger than in S. aurivillii, its length 

 being twice the breadth, and its carinal margin is decidedly longer 

 than in S. aurlvUl'd. On the right side of the capitulum there is no 

 inframedian latus and no indication that there ever was one, and on 

 the left side only a small basal triangular plate; but the absence of 

 these plates may be due to the action of the formalin, though I can 

 not positively afErm that this is the case. The rostral latus is com- 

 paratively lower and wider, its greatest height onl^^ half the width. 

 No rostrum. In other characters of the plates there is no important 

 divergence from 8. aurivilUi^ except for the size, which is much 

 greater than that of any of the series of apparently adult examples of 

 that species. (Fig. 2G r). 



The mandible (Plate V, lig. 3) has teeth more slender than those of 

 S. aiirivilliu the lower point slenderer, with a group of about eight 

 very minute points or spines. 



The maxilla (Plate V, fig. 9) has a pair of stout upper spines, a 

 notch below them. The other spines are shorter and not very 

 numerous. 



The first cirrus has unequal rami of eight and eleven segments. The 

 other cirri do not differ materiall}" from those of S. aurivillii. The 

 terminal appendage is about as long as in S. aurhillii (the individual 

 being much larger), and seems to consist of but three segments, the 

 last terminating in two long spines and one short one. 



SCALPELLUM GALAPAGANUM, new species. 



Type.—C2it. No. 32864, U.S.N.M. 



Type-locality . — Albatross Station 2808, off' the Galapagos Islands, 

 south latitude 00° 36' 30". west longitude 89° 19', in 634 fathoms, bot- 

 tom temperature 39.9". 



The capitulum is long and slender, the length more than double the 

 breadth; much compressed. The ventral margin is nearly straight 

 from base to apex of the tergum. It is composed of 13 (or 14, count- 



