Dr. J. E. Gray on a new /species of Spliu'riuin. 465 



EXPLANATION OF PLATES XIIL XIV. & XV. 



[The numbers attached to the details of tig:ure8 i. iii. and v. indicate the 

 same psu-ts througliout.] 



Plate XIIL 

 FHg. I. Diasfylis Rafhkii. 



2. Carapace seen from above ; show ing the manner in which the 



Literal angles, «, a, meet, without uniting, iu front of the an- 

 tenna! segments, b. 



3. Carapace seen from beneath, with the gnathopoda in position. 



4. a. U[)per antenna, attached to the carapace, seen from below. • 



5. Lower antenna ; «. olfactory organ. ■ 

 fi. Mandible. 



7 & 8. Maxilla;. 



10. Maxilliped; a. branchial sac. 



U & 1:^. 1st and 2nd gnathopoda (2nd and 3rd raaxiUipeds). 



13 & 14. Two anterior pairs of thoracic legs. 



15, 16" & 17- The three posterior pairs ; a. hairs. 



18. Appendages of the two anterior pairs of abdominal segments 

 in the male. 



19. Caudal segments and ai)])endages. 



20. Section of shell. 



21. Gizzard-like structiu-e of stomach. 



Plate XIV. 

 Fig. II. Cuma scorpioides. 

 Fig. III. Eudora iruncatuln. 

 Fig. IV. Cuma Edwardsii. 

 Fig. V. Halia trispinosa. 



Plate XV. 



Fig. V. Halia trispinosa continued. 



Fig. VI. Bodotria arenosa (after Goodsir). 



f^g. VII. Veiuliu gracilis. 



Fig. VI r I. Larva of Hippolyte varians. 



1. Eyes. 



2. L'pper antenna. 



3. Lower antenna. 



i. Pair of larval feet (the first maxilliped of adult). 

 5. One of the two next pair. 



XLII. — Description of a neiv species of Sphserium found near 

 London. By Dr. J. E. Gray, F.R.S., P.B.S. &c. 



These shells were first brought to ine at the British ^luseum 

 by an intelligent collector, Mr. John Howse of Brownlow Street, 

 Endell Street. He discovered them on the 17th of May, in the 

 Grand Junction Canal near Kensal Green, and the following day 

 most kindly furnished me with several living specimens for 

 examination. They are not abundant in the locality named. 



They are decidedly distinct from any of our British specimens, 

 but bear a very great resemblance to Cyclas rhomboidea of Say, 

 found in the rivers of North America. 



Ann. i^ Mag. N. Hist. Ser. 2. Vol. xvii. 30 



