18CS,] DR. W. BAIRD ON THE GEPHYREA. 103 



1. PSEUDASPIDOSIPHON CLAVATUM. 



Sipunculus clavatus, Blainville, Diet. Sc. Nat. torn. xlix. art. 

 Sipunculus, Atlas, t. 33. f, 2, 1828. 



Aspidosiphon clavatum, Diesing, Syst. Helminth, ii. p. 68, 1851. 



Aspidosiphon clavatus, Diesiug, Revis. der Rhyng. I. c. p. 768, 

 1859; ? Quatrefages, I.e. p. 611, 1865. 



Hab. Mediterranean (Blainville). 



Quatrefages says of this species that the figure given of it by 

 Blainville in the work quoted above does not represent the anterior 

 scutellum so characteristic of the genus, and which is found in all 

 the other species described. The posterior extremity is conical and 

 centrifugally radiated, but does not appear to have a regular scutellum. 

 The same may be said of the next species, which is said by Diesing 

 to belong doubtfully to the genus Aspidosiphon. I have therefore 

 made a new genus for the reception of these two species, and for a 

 third, which does not appear to have been previously described. 



2. PSEUDASPIDOSIPHON SPRATTI. 



Sipunculus, sp., Spratt, Lond. Edin. & Dublin Philosoph. Magaz. 

 xxxiii. p. 171, 1848. 



Aspidosiphon 1 spratti, Diesing, Revis. der Rhyngod. Z. c. p. 768, 

 1859. 



Hab. Near the island of Malta, at 320 fathoms depth (Spratt). 



3. PSEUDASPIDOSIPHON GRACILE, Sp. nOV. (PL X. figS. 1, 1".) 



Corpus gracile, elongatum, cylindricum, striis circularibus cinctum, 

 et granuUs parvis, nmnerosis, brunneis obsitum, parte caudali 

 conoidea, subito acuminata, centrifuge radiata, parte unteriore 

 infra proboscidem attenuatam scutelUformi, brunnea, longitudi- 

 naliter rugoso-verrucosa ; pars exsertilis attenuata, granuUs 

 minimis obsita ; 'proboscis retracta. 

 Long, corporis 2\ unc, crass. ]\ lin. ; long, proboscid. g unc, 

 crass. \ lin. 



Hab. Philippine Islands (Mr. Cuming). B.M. 



The body of this peculiar species is long and slender, circularly 

 striated, the interspaces between the striae regularly beset with nu- 

 merous small brown granules. Thecaudal portion terminates abruptly 

 in a short conical point, which is longitudinally centrifugally stri- 

 ated, while the upper portion of the body just beneath the exsertile 

 portion is of a dark brown colour, and longitudinally granulously stri- 

 ated, the two extremities resembling a good deal the scutella of the 

 genus Aspidosiphon. The colour of the body is of a light yellowish 

 hue, the two extremities (which show the resemblance to the scutella) 

 being of a darker brown, resembling in this respect the Sijmnculus 

 clavatus, as represented by Blainville in his figure in the Atlas of the 

 Diet, des Sc. Nat. 



Family III. Loxosiphonid^e. 



Eusipunculidea,Aspidosipho)ies (pSirt.), Diesing, Rev. Rhyng. 1859 . 

 Loxosiphonea, Quatrefages, Hist. Nat. Ann. ii. p. 604, 1865. 



