ON THE ANGUILLULID^. 157 



Pharyngeal cavity rounded. (Esophagiis between ^th and ^tli of total length. Intes- 

 tine abundantly covered witli fat-particles having no distinct tessellate arrangement. 

 Anus yia" from posterior extremity. Spicules -q^" from point to point; accessory 

 'pieces curved backwards, and pyriform in shape. 



Female, not seen. 



Hah. Marine siu*face mud from estuary, Ealmouth. 



2. T. VELOX, n. sp. (Plate XIII. figs. 189-191.) 



Female, length -^^" , breadth 4x4". 



External Characters.— BoAj tapering slightly forwards, but rather abruptly behind 

 vulva, and thence gradually to pointed posterior extremity. Head rounded, provided 

 with 4-6 setse, which are rather long, and directed forwards. Transverse striae well 

 marked, yiwo" apart ; convex lateral prominences of integument swo" in diameter, at 

 T oo " from anterior extremity. 



Pharyngeal cavity rounded, awo" cleep. (Esophagus abovit ith of total length, nearly 

 cylindrical. Intestine moderately well covered with olive-brown fat-particles, having a 

 tessellate arrangement. Anus ^ro" from posterior extremity. Vulva at commence- 

 ment of posterior third of body. Vaginal glands pyriform granular bodies, unequal, the 

 posterior being much the larger and xAo" long- 



Male, not seen. 



Hal). About roots of smaU green sea-weed from tide-pools, Falmouth. 



24. SPH^ROLAIMUS \ Bastian. 



Gen. Chak. Body tapering at extremities. Caudal sucker minute ; sucker-tubes not 

 visible. Integument having transverse and longitudinal markings ; seta; abundant ; 

 cephalic papillae absent. Fharyngeal cavity large and somew^hat spherical, having 

 peculiar sets of parietal linear markings. (Esophagus distinctly muscular, canal 

 defined by three rather bright bands. Intestine rather densely covered with dark- 

 coloured hepatic particles. Vulva considerably posterior to middle of body. Uterus 

 unsymmetrical. Spicules long and narrow. Accessory piece single, posterior, some- 

 what shield-shaped. Ocelli none. Vaginal gland single, pyriform, posterior. Ex- 

 cretory ventral gland tubular, opening near middle of oesophagus. Lateral 

 canals .... 

 Movements rapid, powerful. 



S. HiRSUTUS, n. sp. (Plate XIII. figs. 192-194.) 



Female, length ^", breadth y^". 



External Characters.— Boij thick in proportion to length, tapering slightly anteriorly, 

 but more considerably towards posterior extremity, which is slightly swollen and rounded 

 at termination ; covered with rather long setae, which are largest and most numerous 

 about anterior extremity. Head rounded, somewhat conical. Integument having trans- 

 verse striae t5Wo" apart, and an appearance of longitudinal also, tttooo" apart. 



' vipaLpa, a globe, and \aiixos, the throat. 



