ALCIPPK LAMPAS. 549 



of only a single almost globular (fig. 17, q) segment, instead of 

 three segments ; and the two caudal appendages (r) are very 

 long, and are composed each of only a single segment (instead 

 of two), carrying at its tip two short spines. There are two 

 purple eyes, booths of an inch in diameter, which, after 

 having been dried and then soaked, could be seen to be 

 compound; they are fixed in the usual manner to two 

 rather short apodemes, which latter have their usual origin. 

 But the pupa has a very unusual appearance owing to the 

 presence of a single dark purple eye, half the diameter of the 

 two larger eyes, situated behind and above the latter, and 

 quite disconnected with the apodemes ; this is the eye of the 

 mature animal, which, for some reason, is here developed 

 earlier than usual. The prehensile antenna? are remarkable 

 from being seated very close to the anterior extremity: owing 

 to this, the articulation of the second or main segment with 

 the basal segment, is hardly at all oblique. The whole pupa 

 is of exactly the same length as the pupa ollbla qiiadrivalvis, 

 and so are the antenna?, (see p. 286 of my volume on the 

 Lepaclida?), viz., H jgoth of an inch, but the second segment is 

 narrower, (being only ^ths in breadth in the broadest part), 

 and is longer in proportion, for the disc which forms part of 

 the total length is only ^ths in length, whereas in Ibla it 

 was ^oths ; the disc is here hoof-shaped, as in Ibla. The 

 ultimate segment is remarkably short and narrow, (being- 

 only ^oiooths in width, and less than half the size of that in 

 Ibla) ; it carries (I believe) three terminal spines, and is 

 not notched. Altogether the antenna? more nearly resemble 

 those of Ibla than of any other genus in the family. From 

 the position of the antenna?, and from the length of the 

 second segment, the pupa, when cemented by the disc or 

 third segment, to the supporting surface, adheres, with its 

 posterior end almost vertically upwards. With respect to 

 the young cirripede within the pupa, I could only observe 

 that its anterior end was formed into a blunt point. 



Poioers of Excavation ; Inorganic Deposit of Calcareous 

 Matter ; Attachment. — Alcippe, according to Mr. Hancock, 

 attacks only dead shells of the Fusus and Buccinum, and 

 always on their inner sides, especially on the columella. 

 The excavations, in the specimen which I examined, were so 



