INTERNAL ANATOMY OF BDJILLA. 



525 



nd. Nerve to dorso-vcntral muscles between 



second and third legs. 

 ng. Genital nerve. 

 nm. Mandibular nerve. 

 no. Optic nerve. 

 no' . Branch of the optic nerve. 

 np. Palpal nerve. 

 np". Branch of ])alpal nerve distributed to the 



maxillary lip. 

 nph. Pharyngeal nerve. 

 nv. Nerve to muscles running from the dorso- 



vcrtex to the maxillary lip. 



0. Ova. 



oc. Cornea of the eye. 

 od. Oviduct. 

 ce. Qilsopliagus. 



01. Lens of the eye. 

 OS. Eyes. 



ov. Ovary. 



P. Palpus. 

 pc'. Penial canal, dorsal portion. 

 pc~. Penial canal, ventral portion. 

 pe. Penis? 

 ph. Pharynx. 

 pp. Propharyngeal plate. 

 pr. Roof of the pharynx. 



R. Roof of rostrum. 



re. Receptaculum cibi (sucking-stomach). 

 rd. Retinal disks. 

 re. Retinulae (rods) of the eye. 



rs. Receptaculum seminis. 

 S. Stigma. 



*«. Azygous salivary gland. 

 s(/u. Anterior salivary gland. 

 sgp. Pericibal salivary gland. 

 sgr. Rcniform salivary gland. 

 sgt. Tul)ular salivary gland. 

 *//. Hollows in embedding-sacs to receive testes. 

 sni. S perm-mot lier-cells. 

 T. Testes. 



til. Testicular bridge. 

 td. Duct of the testis. 

 tdm. Common duct of the two testes on one side 



of the body. 

 thl. Tactile hairs of maxillary lip. 

 tl. Tendinous ligament between respiratory 



air-chamber and cuticle. 

 tp. Exterior fleshy cells of testis. 

 //•. Tracheae. 

 tra. Principal tracheal trunk from stigma to air- 

 chamber. 

 //. Tendinous tie between epipharynx and 

 lingua. 

 tvs. Portion of testes functioning as a vesicula 

 seminis. 

 V. Ventriculus. 

 vg. Vestibulum glandula; mucosae (glandular 



antechamber). 

 ]V. Wedge-shaped chamber in reniform salivary 

 gland. 



All the figures, except where specialli/ mentioned, /lace the anterior end, where there is one, nearest to 

 the top of the page. 



All the figures, except 12, 2u, 41, and 42, represent Bdella Basteri. 



Plate 41- 



Fig. 1. (Right central part of Plate.) The epipharynx, propharyngeal plate, and associated muscles 

 seen from below : x 220. The propharyngeal plate with its membranous wrinkled border is 

 at the lower end of the drawing ; tlie one of the occlusor muscles of the pharynx which 

 curves over and depresses the plate passes transversely above it and is partly hidden by it. 

 The epipharynx with its membranous border is the upper part of the drawing, and its semi- 

 lunar spiked membrane is shown at its hind margin. 

 2. (Right top of Plate.) The epipharynx, lingua, propharyngeal plate, and part of the pharynx and 

 pharyngeal sac seen from the right side : x 220. The lingua is cut short ; the propharyngeal 

 plate, occlusor (constrictor) j)liaryngis muscles, and part of the levator tecti pharyngis 

 muscles are seen through the wall of the pharyngeal sac in consequence of its transparency. 

 The duct from the pericibal salivary gland is seen discharging near the hind corner of the 

 epipharynx. 

 SECOND SERIES. — ZOOLOGY, VOL. VI. 71 



