8 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



Summary of Additions and Changes 



l^he genus Liopctrolisthcs is proposed for Petrolisthcs tnitra (Dana). 

 The genus Ncopisosoma is proposed for Fachycheles mexicamis Streets, 

 Pisosoma angustifrons Benedict, P. curacaoense Schmitt, and two species 

 described herein. The genus Clastotoechiis is proposed for Pctrolisthes 

 dijjractus Haig, P. vandcrJwrsti Schmitt, and P. iiodosiis Streets. The 

 genus AUopctrollsthes is proposed for Pctrolisthes angulosus (Guerin), 

 P. punctatus (Guerin), and P. spinifrons (H. Mihie Edwards). The 

 neglected genus Pisidia Leach is resurrected to include those species of 

 Porccllana having lateral spines on the carapace posterior to the cervical 

 groove and fingers twisted out of plane with the manus. 



The following species are described as new: Pctrolisthes Jiobilii, P. 

 galapagcnsis, P. tonsoriiis, P. platyinerus, P. cocoensis, P. artifrons, Neo- 

 pisosoma bicapillatum, N. dohenyi, Pachycheles calculosus, P. velerae, P. 

 trichotuSy P. subsetosus, P. criniinanus, Porccllana corbicola, Megalo- 

 brachium pcruvia/uwi, and Polyoiiyx con/inis. Pctrolisthes gracilis var. 

 brachycarpus Sivertsen is elevated to a full species, P. brachycarpus Sivert- 

 sen. 



The following subspecies is described as nevi^: Pctrolisthes lewisi 

 austrinus. 



Lectotypes are selected for the following species : Pctrolisthes hirtipes 

 Lockington, Pctrolisthes (Pisosoma) setimanus Lockington (now known 

 as Pachycheles setimanus) , Porccllana transversilincata Lockington (now 

 known as Euccramtts transversilineatus) , and Pctrolisthes (Pisosoma) 

 sinuimanus Lockington (now known as Alcgalobrachium sinuimanus). 



The following species are reduced to synonj'iny for the first time: 

 Petrolisthcs acanthophorus (H. Milne Edwards and Lucas), a synonym 

 of P. desmarestii (Guerin) ; Pisosoma fiagraciliata Glassell, a synonym 

 of Pctrolisthes hians Nobili ; and Pctrolisthes (Pisosoma) gibbosicarpus 

 Lockington, a synonym of Pachycheles biocellatus (Lockington). 



The following previously described species are illustrated or ade- 

 quately illustrated for the first time: Pctrolisthes sanfelipcnsis Glassell, 

 P. hirtispinosus Lockington, P. tiburonensis Glassell, P. holotrichus No- 

 bili, P. schniitti Glassell, P. brachycarpus Sivertsen, P. crenulatus Lock- 

 ington, P. ortmanni Nobili, P. leivisi (Glassell), Ncopisosoma ?nexicanum 

 (Streets), Pachycheles setimanus (Lockington), P. crassus (A. Milne 

 Edwards), P. vicarius Nobili, P. marcoriezensis Glassell, Porccllana 

 hancocki Glassell, P. cancrisocialis Glassell, P. paguriconviva Glassell, 



