THE SESSILE BARNACLES. 



199 



spines between the upper pair and the large lower spine, and two 

 below the latter. 



First cirrus (lig. 62.) with rami of 18 and 8 segments, the poste- 

 rior ramus less than half the length of the anterior. Cirrus ii short, 

 with rami of 9 and 8 segments. Cirrus iii with slightly unequal 

 rami of about 10 segments each. There are some minute trifid, mul- 

 tifid and rarely simple spinules on the anterior distal part of all the 

 segments of both rami (fig. 625) ; also a few observed on the anterior 

 ramus of cirrus iv. Posterior cirri have three pairs of spines on the 

 segments, with some minute ones near the bases of the pairs. 



FIG. 62. BALANUS HESPERIUS, OFF SAGHALIN ISLAND, a, IST CIRRUS. 6, 3o SEGMENT OF 



ANTERIOR KAMUS OF CIKKUS III. C, LABRDM AND PALPUS. d, REVERSE SIDE OF PALPUS. 

 C, MAXILLA. 



Another lot having broad scuta and a ribbed wall was taken by 

 Lieut. Geo. M. Stoney in latitude 60 22' north, longitude 168 45' 

 west. 



BALANUS HESPERIUS NIPPONENSIS, new subspecies. 



Plate 49, fig. 6. 



Type. Cat. No. 48191, U.S.N.M., from Albatross station 3T68, 

 off Daikohu Saki, main island of Japan, 25 to 27 fathoms, surface 

 temperature 61 F., June 5, 1900. 



Parietes smooth ; walls otherwise as in the smooth form of B. hes- 

 perius. Scutum having the basal margin about as long as the tergal 

 margin or longer ; the external growth ridges close. Tergum narrow 

 toward the spur. Both opercular valves are very thick (fig. 63). 



The labrum has three teeth on* one side, two on the other. 



Mandible (fig. 61d) having the teeth acute. Maxilla hardly 

 notched under the two great spines, and with six other spines, one 



