KONGL. SV. VET. AKADEMIENS HANDLINGAR. 



BAND. 



21. n:o 5. 



29 



1. LAXCEOLA PELAGICA, TH. SAY, 1818. 



Diagn, Caput rostratum, ante excavatum. Oculi longitudinales. Segmentum primum pereii brevissi- 

 mum, segmentum secundum ac tertium longissima sequalia. Pedes pereii sexti paris quam 

 pereion longiores. Pedes septimi paris pedibus quarti j)aris longitudine asquales sed pedi- 

 bus quinti paris multo breviores. Pedes uri primi et secundi parium longitudine sequales. 



The head is rostrate, excavated anteriorly. The eyes are longitudinal. The first pereional 

 segment is the shortest, the second and third the longest, equal in length. The sixth pair 

 of pereiopoda are longer than the pereion. The seventh pair are as long as the fourth 

 pair, but niuch shorter than the fifth pair. The first and second pairs of uropoda are equal 

 in length. , 



Colour. ? 



Length. 31 mm. 



Hab. The Gulfstream; captured by Capt. Hamilton. 



Syn. 1818. Lanceola pelaf/ica, TH. SAY. — »An account of the Ciustacea of the 



United States». Journ. of the Acad. 



of Natural Sciences of Philadelphia. 



Vol. 1, part. 2, p. 318. 

 » H. MiLNE Edwards. 1830. »Extrait de Eccherches pour servir 



a rUist. uat. des Crustacés araphi- 



podes». Annal. Se. Nat. Torae 20°"', 



p. 387. 

 » " » 1840. Histoire naturelie des Crustacés. Torne 



3""=, p. 77. 

 » Spence Bate. 1862. Catal.Amph.Crust.BritishMuseum,p.304. 



Hjjperia pelagica. 



Vibilia pelagica, 



Although I have had several speciinens of Lanceola for examination, I have not 

 succeeded in identifying any of thein witli Say's species; that which comes nearest it 

 is Lanceola Sayana, but it differs by the long fourth pereional segment, the short seventh 

 pair of pereiopoda, and the broad and long telson. I give below an extract of Say's de- 

 scription (1. c.) containing the niore specilic characteristics. 



The body is soft, the external covering membranaceous. 



The head is very short, transverse, the clypeus projecting into an acute angle, the 

 front concave. 



The eyes are longitudinal, placed opposite the base of the first pair of antennas. 



The first pair of antennce are short, compressed, the basal joints short, robust, 

 concealed by the clypeus. The tlagelluni is linear, compressed, obtuse, attaining the raiddle 

 of the third joint of the second pair. 



The second pair of antennoe are longer than half the pereion, four-jointed, compressed; 

 the basal joints are very short, the third and fourth longer, equal. 



