down each side, and is covered by a slight vertical notch at the anterior ex- 

 tremity ; genital opening large, on the lower surface of the neck, just behind 

 the termination of the lateral slit. Color anteriorly very dark greenish, or oli- 

 vaceous ; posteriorly a much paler green. Length, 3 inches ; breadth, 0.1 

 inch. Common in sandy bottoms in the circumlittoral zone. 

 Hab. Cape of Good Hope, at Simon's Bay. 



GEPHYREA. 



29. Phascolosomum nodulifertjm. Sub-fusiform broad, terminating in a 

 point posteriorly, of a pale brownish color ; surface with numerous hard, dark- 

 brown, large, elevated tubercles, which are uniformly scattered, and extend much 

 beyond the arms toward the proboscis, around the base of which they become 

 smaller. Proboscis smooth, except near its extremity, where it is annulated with 

 narrowj crowded, delicate, black rings, which are seen by means of a magnifyer 

 to be composed of minute echinulations. Mouth with two clusters of short ten- 

 tacles or fimbriations, of different lengths. Color pale brown. Length of the 

 body, 1.15 ; breadth, 0.4 inch. Under stones in the littoral zone. 



Hab. Australia, at Port Jackson. 



30. PHAscoLosoMTjiAi SEMiciNCTUM. Of a light brown color, with bluish re- 

 flections ; surface very smooth in appearance, but showing, under a magnifyer, 

 a few minute, black, granulations, distantly scattered. Proboscis very long, an- 

 nulated with narrow black rings towards the extremity ; mouth with two tufta 

 of blunt tentacula. Found in holes in coral, etc., in the coralline zone. 



Hab. Cape of Good Hope, in False Bay. 



In both these species the generative organs are placed one on each side of 

 the rectum ; their openings externally are indicated by a bluish spot on each 

 side of, and distant from, the anus. 



ANNELIDA. 



31. Tecturella luctator. Subquadrilateral, turrited above, of the same 

 thickness throughout except toward the posterior extremity ; the rings usually 

 indicated by transverse folds of the envelope which is loose and flabby when the 

 animal is alive, agglutinating sand, and of a yellowish-green color. Rings 

 about forty in number. Anterior tentacles capable of being protruded to con- 

 siderable length, when they are smooth and cylindrical. Posterior tentacles 

 dark green, slender, and very numerous, in two clusters. Superior setae capil- 

 lary, as long as the inferior ones, and eight in number in each of the conapressed 

 fascicles which contain them. Inferior pinnae containing each a single long 

 stout hooked seta. Length, 1.5 inch. Pound loosely attached tsnder stones 

 near low-water mark. 



Hab. Cape of Good Hope, at Simon's Bay. 



32. SiPHONosTOMUM L/EVE. Body thickest near the middle, suddenly tapering 

 and slender posteriorly ; much smoother than is usual in the genus, showing 

 only the delicate, close, slightly-raised annulations. Superior setae capillary ; 

 inferior ones short, strong, curved, but not hooked. Setae of three segments di- 

 rected forward ; those of the first in four fan-like clusters, arranged so as to 

 form a circle around, the mouth ; those of the second segment much fewer in 

 number, and placed on the sides of the body only ; those of the third not con- 

 spicuous. Anterior tentacles long, diverging ; posterior ones shorter, slender, 

 about twenty in number, arranged in a half-circle as in Sabella. Colors : body 

 pale reddish ; tentacles zonate with white, brownish, and pale green. Length, 

 2 inches ; breadth, 0.2 inch. Found in. holes which it forms in fragments of 

 corals, in the coralline zone. 



Hab. Cape of Good Hope, at False Bay. 



33. Ch;etoptertjs capensis. Small, short, having a general resemblance to 

 C. pergamentaceus ; i-nhabiting a papyraceus tube. Annulations about thirty in 

 number. Cephalic ring equalling in size the succeeding or first ring. In the 



