BENTHESICYMUS ALTUS. 203 
in the two sexes. The dorsal portion of the cervical groove is more distinct 
than in H. spindorsalis. The sixth abdominal segment is longer than in 
H. spinidorsalis, and there is a difference affecting the inner branch of the 
second abdominal appendages of the male, viz. the tooth-like process, which 
is in HZ. spinidorsalis shorter than the external plate, in HZ. triton is developed 
into a broad plate which exceeds in length the external plate. This differ- 
ence will be most easily comprehended by inspection of Figs. 1° and 2 on 
Plate L. 
The podobranchia of the twelfth somite is even smaller than in Z. 
spiudorsalis. 
Length, 127 mm. ; carapace, 44.5 mm.; rostrum, 6 mm. 
Station 3360. 1672 fathoms. 1 fem. 
& Bee dey a 1 male, 5 fem. 
cs SSSTE Ph iiaee ee 3 males, 1 fem. 
This species is perhaps identical with Hemipeneus carpenteri Wood-Mason,* 
dredged in the Laccadive Sea and in the Bay of Bengal, 1091-1644 
fathoms. 
BENTHESICYMUS Bartz. 
Ann. Mag. Nat. Hist., 5th Ser., VIII. 190, 1881; Rep. Challenger Macrura, p. 326, 1888. 
Benthesicymus altus Bare. 
Ann. Mag. Nat. Hist., 5th Ser., VIII. 191, 1881; Rep. Challenger Macrura, p. 336, Plate LVIII. 
Fig. 1, 1888. 
Station 3360. 1672 fathoms. 1 male, 3 fem. 
os 350s 147 < 1 fem. 
Ooo et 1 male, 1 fem. 
eso leas Iiihen ee 1 male, 2 fem. 
Co ate vae Alay 2 males, 5 fem. 
ee ooOG. Noman ace 1 male, 1 fem. 
ee ooo ose bee 1 fem. 
cs BVlsy. Ila) 7 Ot 1 male, 1 fem. 
eee eae ease a 2 males, 1 fem. 
coe Salon S79) 2 males, 9 fem. 
In Bate’s figure of this species there appears to be a small spine on the 
side of the carapace, although none is mentioned in his description. In the 
«“ Albatross” specimens there is no spine at this place. The fragile filiform 
* Ann. Mag. Nat. Hist., 6th Ser., VII. 189, VIII. 286, 1891. 
