67 



species of Lanceola, the eyes in L. say ana and L. felina^ have retained 

 crystalhne prisms (Woltereck, 1909), which have disappeared from the 

 other representatives of the family that almost never ascend to the sur- 

 face layers. 



4. Lanceola pacifica Stebbing, 1888 (Fig. 9) 



Stebbing, 1888: 1302; Stephensen, 1918: 14.— var. robusta 

 Woltereck, 1909: 160. 



Sexually mature females reach a length of 22 — 38 mm, males 

 26-34 mm. 



The body is flattened dorsoventrally. The dorsal surface of the 

 somites of the pereon and pleon is sculptured. A rostrum is absent. The 

 eyes are reniform, large but the ommatidia lack crystalline prisms. 



In antennae I the flagellum has a short broad proximal segment, 

 tapering distally somewhat more sharply than in L. sayana; the distal 

 segments of the flagellum are neither fused nor flattened; the 1st and 

 2nd segments are dolioform, their length equal to or slightly less than 

 their width; the relative length and shape of the 3rd segment are variable; 

 the apical setae are weak and short. 



The mandibles have a relatively narrow cutting edge and a stout 

 palp, roughly 1.5 times the length of the mandible. Maxillae I have a 

 broad inner lobe. Maxillae II have narrow lobes, the inner ones being 

 slightly broader than the outer. 



Pereopods I have a broad 2nd segment which is almost oval in 

 adults; the 5th segment is distally broadened, its maximum width roughly 

 equal to its length; the 6th segment is conical with a broad base occupy- 

 ing the greater part of the distal margin of the 5th segment. Pereopods II 

 have a broad 2nd segment, a slightly broadened 5th and a narrowly con- 

 ical 6th. Pereopods III and FV are identical in length and structure; their 

 2nd segment is broad and broadens distally; the 4th segment in young 

 individuals is shorter, in adults longer than the 5th segment; the claw 

 is slightly curved. Pereopods V are longer than pereopods IV; their 2nd 

 segment is slightly shorter than or equal to the 4th and 5th together; the 

 relatively broad 4th segment, sometimes very slightly broadened distally, 

 is shorter than the mutually equal 5th and 6th segments. Pereopods VI 

 are somewhat longer and stouter than pereopods V; their 2nd segment is 

 longer than or almost equal to the 4th segment, which in turn is longer 

 than or equal to the 5th but shorter than the rod-shaped 6th segment. 

 Pereopods VII are shorter than V, their 2nd segment shorter in adults 

 but longer in young individuals than the 4th and 5th segments together. 

 The claws on pereopods V-VII are thin, curved, and retractile. 



• The structure of the eyes of L intermedia has not been studied. 



