Barnacles of the Genus Scalpellum. 101 



an upper latus in the hermaphrodite it seems to me to be 

 probably related to such forms as Scalpellum stratum, Auri- 

 villius, from the West Indies, and S. sinense, Annandale, 

 from the seas of Burma and China." The affinity of S. nu- 

 dipes with S. sinense is at once evident on comparing the 

 excellent figures that Annandale has given of both species, 

 but I am at a loss^to understand the reference to S. stratum. 

 In that species, as figured by Auri villi us, there are two 

 median latera, the " upper latus " and the " inframedian 

 latus " ; in the present species, as in S. sinense, there is only 

 one, whatever its proper designation may be. 



Male. — A very small specimen was attached between the 

 scuta below the level of the adductor muscle in the Netley 

 Hospital specimen. It is less than half the size of the young 

 male figured by Annandale, the capitulum measuring 1*1 mm. 

 in length, and it carries to a greater degree the elongation 

 of the capitulum which Annandale found to distinguish the 

 young from the adult male, the breadth being only 0*7 mm. 

 It further differs very remarkably in having only five 

 calcified valves, there being no trace of a rostrum. The 

 peduncle, about 06 mm. in length, is clothed with long setse 

 which are most numerous on the carinal side. The internal 

 structure is not well preserved, but the mandible can be seen 

 to have only three teeth besides the inner angle ; there are 

 six pairs of cirri and a short penis, and the caudal appendages 

 are minute, unjointed, with two or three long apical setae. 



If this be really an earlier stage in the development of the 

 male than those figured by Annandale — and there seems to 

 be no reason to duiibt that it is — it infringes in a very signi- 

 ficant fashion the rule that "in all known males of the genus 

 in which the calcareous armature is not degenerate there are 

 six valves'" (Annandale, /. c. p. 286). It would seem to 

 indicate, in fact, that the rostrum forms no part of the 

 " primitive armature," which is thus reduced to that typical 

 of the family Lepadiike. 



Scalpellum {Smilium) acutum, Hoek. 



Scalpellum acutum, Hoek, Rep. ' Challenger ' Cirripedia, 1883, p. 80, 



pi. iii. tig. 19, pi. viii. fig. L2 ; id. ' Siboga ' Exp. Cirripedia Pedun- 



culata, 1907, p. 64, pi. vii. fig. 1. 

 S. {Smilium) acutum, Annandale, Rec. In'd. Mus. v. 1910, p. 154; id. 



Mem. lnd. Mus. vi. 1916, p. L29, pi. vii. tig. 4. 

 S. lonyirostrum, Gruvel, Bull. Mus. Paris, vi. 1900, p. 190 ; Exp. ' Tra- 



vailleur' et 'Talisman.' Cirrhipedes, 1902, p. 70, pi. ii. figs. 4, 5, 

 - pi. iii. figs. 17-21. 



