300 
THE VOYAGE OF H.M.S. CHALLENGER. 
annulatedj tliougli the preparation is not in good condition'. The tentacular cirri reach 
to the anterior margin of the buccal segment, which is of average breadth. The eyes 
present no peculiarity. 
The maxillae (Fig. 56) have an average curve and are pale brown. The left great 
dental plate has four well-marked teeth, and the right also four. The left lateral 
paired plate shows three teeth, and the unpaired of that side the same number. 
The right lateral has six teeth. The latter and the left paired plate have a pro- 
minent blackish -brown band at the base ventrally. A single terminal plate exists 
at the end of each paired plate, so that the example may be immature. The 
mandibles (Fig. 57) have much elevated crowns of an obliquely conical shape, with 
concentric markings. 
fiG. 56. — Maxillse and mandibles of Mar- 
physa goodsiri, n. sp. ; x 15 diameters. 
Fig. 57. — Mandibles of the same species, from 
the dorsal aspect ; x 15 diameters. 
The branchiae are represented on the twenty-fifth or twenty-sixth foot by a single 
long process on each side of the body. Each branchia 
becomes bifid about the thirty-sixth foot, the division 
occurring some distance above the base ; and this arrange- 
ment (PI. XXXVIII. fig. 8) continues to the end of the 
fragment. 
Anteriorly the feet (PL XXXVIII. fig. 7) have three 
stout spines, the two brownish lower with somewhat 
curved, clavate tips, while the upper are pale and pointed. 
Posteriorly a single pointed brownish or blackish spine 
and a blackish hook (PI. XIXa. fig. 19) occur, the great 
fang of the latter being directed ujiward and outward. 
The jointed bristles (PI. XIXa. fig. 18) have a some- 
what rapid curve at the tip from the prominence of the 
second process, and the latter becomes longer in the posterior feet. 
The superior bristles possess comparatively large and broad tips, which taper to 
a fine point distally. The inferior bristles of the group (PI. XIXa. fig. 20) have 
proportionally broader tips. 
In transverse section this species conforms to the type seen in Marphysa sanguinea. 
The nerve-cords are, however, much larger, and form a definite and somewhat massive 
band above the neural canal, whereas in Marphysa sanguinea the nerve-tissue presents 
the aspect of a margin to the large median neural canal. On the whole the cords 
are placed higher than in Marphysa sanguinea. The symmetrical arrangement of 
the muscles enveloping the great blood-vessels above the cords is not distinct in the 
new form. 
Marphysa goodsiri somewhat resembles the Eunice Jilamentosa of Grube^ from 
St. Croix, one of the Windward Islands (Antilles). The tentacles of the latter, however, 
1 Annul. (Erstediana (sep. Abd.), Bd. ii. p. 30 ; Vidensk. Meddel. f. d. nat. Foren. i Kpbenhavn, p. 56, 1856. 
