ASTEROCHERID^E. 193 



A single specimen from Plymouth Sound, collected on 

 August 19th, and another from Salcombe, collected on 

 September 9th, 1903. 



ACONTIOPHORUS scuTATUS (Brady & Robertson). 



1873. Solenostoma scutatum, B. & R., Ann. & Mag. Nat. Hist. ser. 4, 



vol. xii. p. 141. 

 1899. Acontiophorus scutatus, Giesbrecht, Die Asteroclieriden, 



pp. 12, 13, 81, pi. i. fig. 5 ; pi. iv. figs. 35-52. 



Procured sparingly on several occasions, viz. : Salcombe 

 in 1875 and 1903 ; near Starcross in 1880 ; at Exmouth ; 

 near Duke Buoy, 1889, and off Jenny Cliff Bay, Plymouth, 

 in August 1903. 



SCOTTOCHERES ELONGATUS (T. & A. Scott). 



1894. Acontiophorus elongatus, T. & A. S., Ann. & Mag. Nat. Hist. 



ser. 6, vol. xiii. p. 145, pi. ix. tigs. 15-20. 

 1899. Scotfocheres elongatus, Giesbreclit, Die Asteroclieriden, pp. 17, 



82, 104, pi. iv. tigs. 1-13. 



One specimen from Corallina, near low-water at Plymouth, 

 and another from material washed from Pecten opercularis 

 near the same place in August 1903. Though this species 

 has a wide distribution, it does not appear to be very 

 common. 



MESOCHERES, Norman & T. Scott. 



Body somewhat similar to Scottocheres in general appear- 

 ance, the cephalothorax seen from above being ovate in 

 outline, while the abdomen is narrow and elongated. The 

 antenuules are composed of twenty-one joints, and their 

 structure is similar to that of the antennules of Asteroeheres ; 

 the antennae also resemble those of that genus ; the mandibles 

 and maxillse were imperfect and their structure could not be 

 sati.-factorily made out. First maxillipeds small but moder- 

 ately stout, their terminal claw elongated and strongly 

 hooked and bearing a long spine attached near the base. 

 Second maxillipeds long and slender, and similar in structure 

 to the same appendages in Asteroclieres. The first four pairs 

 of thoracic feet are somewhat similar to those of that genus. 

 Fifth pair very small and apparently two-jointed. 



This genus partakes of the characters of the two genera 

 Axterochei-es and Scottocheres, but differs from buth as 

 described above. 



o 



