Vol. 54.] THE DECAPOD CRUSTACEA OF ENGLAND. 33 



hand ; on the sides of the dactjlopodite are setigerous puncta, and 

 the outer border is Jflat ; a single tooth occurs on the dentary 

 border. Length of carapace =10 to 36 mm. ; length of average 

 adult =18 mm. 



Affinities. — The more ovate form of the carapace, the larger and 

 more prominent rostral portion, the difference in the number and 

 arrangement of the areolar tubercles on both the cephalic and the 

 scapular regions, distinguish this species from Homolopsis JEchuardsii, 

 some of the several forms of which it approximately resembles. 

 The slight depression, which apparently performed the functions of 

 a false orbit, is a character which occurs in Homolopsis and also in 

 the recent form Homola. Bell's reference to an alliance of the genus 

 with Mithraoc^ as Dr. Woodward has remarked, is not very evident; 

 probably Mithracites may be more correctly placed between Hyas 

 and Micipjpe. 



Distribution. — Lower Greensand, There are twenty specimens 

 in the Woodwardian Museum, one of which is 38 mm. in diameter ; 

 others occur in the British Museum and in the Museum of Practical 

 Geology — all coming from Atherfield, Isle of Wight. 



Genus Teachynotus, Bell. 



Trachtnotxjs sulcattjs, Bell. 



1863. Bell, Monogr. pt. ii, p. 2 & pi. i, fig. 1. 



Supplementary. — The only examples of this species known to me 

 are those in the British Museum (Cunnington Coll.) described and 

 figured at twice the natural size by Bell. The singular transverse 

 sulcation of the scapular area is more strongly expressed in the 

 figure than in the specimen, and the arrangement of the sulci is 

 not quite accurately shown. The carapace bears a general resem- 

 blance to that of Dromiopsis from the Faxo Beds, and suggests a 

 phy logon etic alliance with that genus. 



Distribution. — Upper Greensand, Wiltshire. 



Family Cyclometopa. 



(i) Subfamily Portunidge. 



Genus Neptuntjs, de Haan, emend. Milne-Edwards. 

 Neptuntjs vectensis, sp. nov. (PI. II, fig. 2.) 



Description. — Carapace about a fourth wider than long, slightly 

 convex transversely. Interorbital portion of the frontal margin 

 straight, slightly prominent, quadridentate (sex-dentate, including 

 the internal orbital processes). Orbits large, transversely oval. 

 Dorsal surface slightly and sparsely granulated ; the normal cephalic 

 and scapular lobes indistinctly defined. Sternal plastron broadly 

 obovate, half as wide as the carapace, minutely punctated ; 

 episternum bearing the large external maxillipeds — three-fourths 



Q. J. G. S. No. 213. D 



