474 THE VOYAGE OF H.M.S. CHALLENGER. 



filaments are long, and richly studded with those memhranous organisms that I have 

 named auditory cilia." The discovery by Claus of otoUths in the Oxycephalidai is not 

 noticed. 



In speaking of the second pair of antennse, Spence Bate says, " in the Amphipoda this antenna 

 is simple and normally well defined, the five joints of the peduncle and the flagellum being 

 separate and distinct." But according to my experience the two first joints of the peduncle 

 are as a rule more or less fused together. 



" Among the Hyperidaj," he further says, " the [second] antenna is considerably impoverished, 

 and in many genera it is rudimentary, while in Phrosina it appears to be absent." In 

 regard to Phrosina, however, I may state that I have just 'received (June 27, 1887) from 

 Dr. Bruce specimens taken at Iilalta, of Phrosina semilunata, Eisso, i , in which both 

 pairs of antennae are well developed with long flagella. 



The three sections of this paper are headed respectively " Correlation of Appendages," " On 

 Exuviation," and " On Eenewal of Appendages." 



1878. BovALLius, Cael, born 1849 (Hj. Theel). 



Notes on Ptcrygocera arenaria, Slabber. (Bihang till Svenska Vetenskaps- 

 Akad. Handlingar, IV, No. 8), pp. 1-27, pis. 1-4. 1878. 



It has been shown by S. I. Smith that the names Sulcator, Sp. Bate, 1854, and Pterygoeera, 

 Latreille, 1825, must yield to the earlier name, Lepidadijlis, Say, 1818, but in my opinion 

 the name Haustorius, proposed by P. L. S. IMiiUer in 1775, has the preference over all its 

 competitors. The elaborately and beautifully illustrated notes by Bovallius (in English) 

 open with an account of the adventures of Slabber's species, not however taking into 

 account Lepidadylis dytiscus of Say. A chronological list of the literature is given, 

 with a corresponding omission. A new subfamily is created, Pterygocerinae, thug 

 defined : — 



" Cephalon rostrum ferens minimum, articulum primum antennarum non tegens. 



" Labium superius breves, apice rotundatum. 



'• Mandibulffi magnae, palpo elongato, articulo palpi secundo tertio longiore. 



" Maxillte primi paris parvje, palpo biarticulato. 



" Pedes maxiUares palpo laminari. 



" Antennae superiores flagello appendiculari instructae. 



" Gnathopoda primi paris dactylo unguiculato, secundi paris dactylo minimo duplici. 



" Pereiopoda primi et secundi paris articulis ultiniis ligulas formantibus. 



" Pereiopoda sequentia dactylis carentia. 



" Telson simplex. 



" Corpus non valde compressum. 



" The family Pterygocerinae is distinguished from the Pontoporeiinaj and Phoxinfe by its general 

 form as weU as by the abnormal structure of the dactyli of the gnathopoda. Another re- 

 markable character is presented by the peculiar form of the carpus and propus of the first 

 and second pairs of the pereiopoda, which I have thought proper to denote as spoon-shaped 

 ' liguliformis.' Pterygoeera differs, moreover, from the Plioxinse by the second joint of 

 the mandibular palpus being larger and longer than the third, and also by the telson net 

 being bifid, but simple and only incised." 



In the very fuU and detailed account of the species it is mentioned that " with the age of the 

 animal the size of the eyes diminishes also, and in the oldest they are discovered only with 

 difficulty. Ths pigment is red, the eye-lens short, thick, bluntly conical, the surface of the 

 eye irregularly facetted." 



