PEOF. E. RAY LANKESTER OX GOLFINGIA MACINTOSH!!. 



473 



Intestinal spire traversed by a spindle-muscle, which is fastened at the hinder end of the body. 

 Only two retractors, ventral in position and often fused witb one another. 



7. Cloeosiphon. — Directly in front of the anus a calcareous ring, from the centre of which the introvert 



is extruded. Longitudinal musculature continuous. Hooklets bifid. Tropical. 



8. Golfingia. — A praeanal corneous tube (sclerorhynchus) and a caudal corneous tube (scleropyge) . 



The introvert issues centrally from the praeanal tube, which is, in fact, its basal portion indurated. 

 Tentacles sis, pinnate, surrouuding the mouth in a circle. Retractors four, two ventral longer, and 

 two dorsal shorter, the two pairs arising at some distance from one another on the body-wall. 

 Chitinized hooklets are present at the oral extremity of the introvert ; further back on the same are 

 found cylindrical and subspherical chitinized papillae. Longitudinal musculature continuous. 

 Intestine not coiled throughout in a spire, not fastened posteriorly ; a spindle-muscle present. Two 

 freely suspended nephridia. Vascular system uncertain. Known species large (eight inches long 

 when expanded). 



IV. Only two lamelliform tentacles. Four retractors. Few intestinal loops, quite free. 

 No vascular system. 



9. Petalostoma. 



V. No tentacles. No vascular system. A single retractor, 



10. Oxchn'eso.ma. — Introvert long. Body small, pear-shaped. 



11. Tylosoma. — No introvert (?). Body cylindrical, thickly beset with papillae, which are more closely 



set and larger at the front and hind ends of the body. 



A single nephridiwm. 



DESCRIPTION OF THE PLATES. 



Letters apply to all figures. 



a. Anus, in the median dorsal line. 



b. The sclerorhynchus (anterior sclerite) . 



c. The scleropyge (posterior sclerite). 



, * > Right and left nephridial aperture. 



e. Mouth. 

 /. Nerve-cord. 



ff. Nerve-cord attached to the introvert. 

 g. Nephridia (brown tubes, oviducts or sperm- 

 ducts.) 

 h. Anterior retractors of the introvert. 

 i. Posterior retractors of the introvert. 

 k. Rectum. 

 /. (Esophagus. 

 m. Muscular band accompanying the rectum. 



Musculature of the body-wall (smooth). 



Epidermis and cutis. 



Muscular attachment of the nerve-cord within 



the scleropyge. 

 Six terminal filaments of the nerve-cord (cauda 



equina). 

 The peri-oral tentacles. 

 Papillary surface of the introvert. 

 Point of attachment of the retractor-muscles to 



the introvert. 

 Chitinized ridges on the cuticle of the introvert. 

 Hooks on the same. 

 Soft papillae. 

 Chitinized papillae. 

 The introvert. 



Plate LV. 



Fig. 1. The specimen of Golfingia Maclntoshii of natural size and appearance, after ten years' preserva- 

 tion in spirit. 



2. Diagram of Golfingia Maclntoshii, with expanded introvert and tentacular crown : natural size. 



3. Ventral view of the scleropyge. 



4. Dorsal view of the scleropyge. 



SECOND SERIES. — ZOOLOGY, VOL. II. 72 



