76 On some Animals found amongst the Gulf -weed. 



slightly concave, with the posterior edges of the latero-peduncu- 

 lar divisions serrated ; the posterior and abdominal angle of this 

 part of the shell is incurvated and pointed, and its external sur- 

 face is deeply sulcated, the sulci all radiating from the posterior 

 abdominal angle to the dorsal edge of the division, where they 

 form small but very distinct serrations. Dorsal division of the 

 shell smooth, extending almost the whole length of the dorsum, 

 and reflected upon the posterior dorsal angles of the latero-pe- 

 duncular division. A small obsolete tooth may be observed upon 

 the dorsal edge near its anterior extremity. The antero-lateral 

 are much smaller than the peduncular divisions of the shell, and 

 are also sulcated, the sulci radiating from the anterior point to- 

 wards the abdominal edge : the ridges formed by these sulci are 

 armed in both divisions with minute teeth, the points of which 

 in the peduncular portion all project towards the dorsum, those 

 in the anterior towards the abdomen. Attached to a portion of 

 Fucus nutans. 



The species now described differs in some points from the 

 figure given by Quoy and Gaimard in the ' Voyage de TAstro- 

 labe,' which beautiful work I have been able to see through the 

 kindness of Mr. Grut ; I thought it unnecessary however to give 

 another specific name. 



Several specimens of Scyllcea pelagica were in the bottle, and 

 the spawn (PL VII. fig. 14) of this animal was attached in several 

 places to the Fucus in rather irregular coils ; the central extre- 

 mity adhered to a stem of the Fucus, the succeeding parts sur- 

 rounding it in coils, the external extremity being attached in the 

 same manner as the central one. 



EXPLANATION OF PLATE VIL 



Fig. 1. Nautilograpsus miriutus, nat. size. 



Fig. 2. Hippolyte ensiferiis, mag. three times. 



Fig. 3. PalcBmon natator, mag. twice. 



Fig. 4. Amphitoe pelagica, enlarged. 



Fig. 5. Bopyrus sguillarum, female, magnified. 



Fig. 6. , young. 



Fig. 7. , male. 



Fig. 8. The abdominal surface of the head of male Bopyrus. 



Fig. 9. One of the ambulatory legs of male Bopyrus. 



Fig. 10. One of the ambulatory legs of female. 



Fig. 11. Last abdominal segment of female Bopyrus, showing the entire 



segment. 

 Fig. 12. Drawing of an ovum, a cluster of which were attached to the Fucus. 

 Fig. 13. Anatifa sulcata, magnified, attached to a portion of the Gulf-weed. 

 Fig. 14. Spawn of Scyllaa pelagica. 



