CONCHODERMA HTJNTERI. 153 



Carina longer than the scuta by about one fifth or one 

 sixth of its own length, blunt at both ends, considerably 

 bowed. 



Again, I possess a group of remarkably fine specimens 

 given me by Mr. L. Reeve, from the southern ocean, (as 

 I infer from a young Lepas australis adhering to them,) in 

 which all the individuals, young and old, are characterised 

 as follows : — Scuta, with the lateral lobe generally broad, 

 but to a very varying extent, with the upper and lower 

 lobes extremely sharp. Terga separated from the scuta, 

 by one and a fourth of their own length, and by their 

 own length from the carina; somewhat acuminated at 

 both ends, nearly straight, with a very slight shoulder 

 near the umbo. Carina equalling the terga in length, and 

 about three fourths of the length of the scuta ; neither the 

 upper nor lower point much acuminated. All the valves 

 most imperfectly calcified : in one specimen, the scutum 

 on one side was simply horny, without a particle of cal- 

 careous matter. The summit of the capitulum nearly 

 intermediate in outline between the common square, and 

 bluntly-pointed form of var. ckelonopkilus. I compared 

 the cirri and trophi with those of a common variety, and 

 could detect not the smallest difference. This variety 

 differs from var. Olfersii, in the less development of its 

 carina, and from ckelonopkilus, in the greater development 

 of its carina, and especially of its terga* It would appear 

 as if the great variability of the valves was connected with 

 the absence of calcareous matter. 



3. CONCHODERMA HUNTERI. PL III, fig. 3. 



Cineras Hunteri. R. Owen. Cat. Mus. Coll. of Surgeons, 

 (1830), Invert. Parti., p. 71. 



C.valvis angustis: scutis trilobatis, prominentia later ali 

 non latiore quam inferior : tergorum parte superior e pcene 

 rectangule secundum aperture marginem fleccd .- carina 

 valde arcuatd : pedunculo brevi, in capitulum coalescente. 



