24 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
genital pore, turning posteriad and crossing ventral to anal segment 
to right side of urosome; portion of sac free of coupler extending 
anterolaterad. 
Two types of spermatophore placement observed in diandra: type 
1 placement considered normal; type 2 placement less common and 
appears to be nonfunctional. In type 1, described above (figs. 6g, h), 
coupler envelops genital segment posterior to hook on left side and 
extends back to cover anal segment. Actual site of attachment of 
neck not observed but appears to emanate from genital pore. 
Type 2 placement with spermatophore similar to that in type 1, 
but coupler cemented to left corner of TV, 180° bend in sac anterior 
to terminal portion of sac which extends posteriad; resulting orienta- 
tion of spermatophore sac and coupler 180° out of phase with type 1 
placement. Neck cemented to left corner of TV, totally lacking 
contact with genital pore. 
Co.toraTion.—Living and preserved specimens (5 percent formal- 
dehyde solution in sea water) exhibit the same sets of carmine struc- 
tures between TI and TII and in TIII as described above for jollae. 
The cuticle on the ventral side of the prosome and on the swimming 
legs is tinted blue. Otherwise the species is translucent and shows 
no pronounced coloration. 
Typrs.—Female holotype, USNM 110758, allotype, USNM 110759, 
selected from material collected at station F—5 (lat. 24°14’ N, long. 
111°18’ W), bottom depth about 20 m, located roughly 1 mile offshore 
of Boca Flor de Malba, Baja California, an estero flanked on either 
side by moderately sloping sandy beach coastline. Additional refer- 
ence specimens are USNM 110760 and SMIC XVIII-2. 
DistriputTion.—Plankton samples containing L. diandra (table 3) 
were collected in coastal waters usually within 1 mile of shore. The 
northernmost positive station (F—5) is located on the Pacific coast of 
Baja California just south of Almejas Bay (24°20’ N). Along the 
Gulf of California coast of Baja California, the species occurred as 
far north as Santa Rosalia (27°19’ N). From the eastern shore on 
the Mexican mainland we have four records, all coastal and from the 
region between Banderas Bay (20°26’ N) and Tenacatita Bay (19° 
15.3’ N). The distribution of L. diandra is shown in figure 11. 
During portions of the year the range will probably be found to extend 
farther north (approximately a hundred miles) on both shores of the 
Gulf. The only remaining broad question of range concerns how far 
south the species extends along the Central American coast. 
In general, the calanoids found in samples containing diandra were 
a mixed assemblage of coastal, neritic, and oceanic species which have 
a wide distribution in the eastern Equatorial Pacific. Samples rich 
in diandra were also rich in the coastal and neritic species of this 
