ON THE ANGUILLULIDE. 159 
especially in ventral region before and behind anus, where there is a linear series. Anus 
j; from posterior extremity. Spicules very long and narrow, but slightly rounded and 
enlarged at points, length 133^; accessory piece none. 
Hab. Small green sea-weeds from tide-pools, Falmouth. 
9, C. PROFUNDI, n. sp. (Plate XIII. figs. 198-200.) 
Female, length +”, breadth 355". 
Erternal Characters.—Body light-coloured, slender, tapering gradually forwards, but 
more notably towards posterior extremity, which is rather long and filiform, having two 
small setæ at its termination. Head truncate, furnished with a circlet of six stout and 
long, spreading setæ. Integument having longitudinal markings, transverse not visible ; 
two eireular(?) depressions, one on each side of head, and about 3353" in diameter. 
Pharyngeal cavity very small, almost wanting. (Esophagus about ith of total length, 
gradually widening towards termination. Intestine covered with pale-coloured hepatie 
particles, having a tessellate arrangement. Anus 195 from posterior extremity. Vulva 
about the middle of body. Uterine segments rather short. Exeretory duct opening 
opposite middle of æsophagus. 
Male, length +”, breadth 333”. 
Anus +45” from posterior extremity. Spicules very long, slightly curved, lengthy 43" , 
apparently not tubular, but grooved from angular bending. Accessory piece small, 
indistinct. 
Hab. In mud dredged up from a depth of 20 fathoms, Falmouth Harbour. 
26. SPIRA !, Bastian. 
Gen. CHAR. Body tapering at extremities. Caudal sucker very small and indistinct ; 
sucker-tubes absent. Zntegument-having transverse striæ ; two small, lateral, cir- 
cular, convex prominences or depressions of integument in cervical region; setæ 
not abundant, principally cephalic ; cephalic papillæ wanting. Pharyngeal cavity 
wanting. Œsophagus short, distinetly muscular, with a simple terminal swelling. 
Intestine moderately well covered with rather large, light-coloured hepatic particles. 
Vulva at middle of body. Uterus bifid; segments symmetrical Spicules curved, 
moderately broad, enlarged at upper extremities. Accessory pieces two, nearly 
straight. Ocelli none. Eixcretory ventral gland... Lateral canals . . .. 
Movements active. 
1. 8. PARASITIFERA, n. sp. (Plate XIII. figs. 201-203.) 
Female, length 45, breadth 345”. 
External Characters.—Body opaque white, tapering anteriorly and also gradually to a 
point posteriorly. Head rounded, provided with a eirelet of 4-6 short sete. Integu- 
ment with faint transverse striæ sokov” apart; small lateral hemispherical prominences 
close to anterior extremity. 
Esophagus about qrth of total length; terminal swelling nearly globular. Intestine 
" areipa, a coil, from the frequency with which they twist their bodies into this form. 
