I8OPODS OF NORTH AMERICA. 



383 



SYNIDOTEA CONSOLIDATA (Stimpson). 



Idotea consolidata STIMPSON, Proc. Cal. Acad. Sci., I, 1856, p. 89; Bost. Jour. Nat. 



Hist, VI, 1857, p. 503. 



Edotea bicuspida MIERK, Jour. Linn. Soc. London, XVI, 1883, p. 66. 

 Si/nidotea consolidata BENEDICT, Proc. Acad. Nat. Sci. Phila., 1897, p. 393. 



RICHARDSON, Proc. U. S. Nat. Mus., XXI, 1899, p. 848; Ann. Mag. Nat. 



Hist. (7), IV, 1899, p. 268; American Naturalist, XXXIV, 1900, p. 227. 



Locality. Pacific Grove, California. 



Bocty ovate, twice as long as broad, 4 mm. : 8 mm. 



Length of abdomen, 3 mm. 



Head with a slight median excavation. Posterior 



to the median notch are two small tubercles on either 



side of the median line. Lateral to these tubercles 



and in front of the eyes are two larger tubercles, 



one on either side. Between the eyes in a trans- 

 verse line are two small tubercles, one on either 



side of the median line and a little farther apart 



than the two anterior tubercles. Posterior to these 



two tubercles in the middle of the head is one small 



tubercle in the median line close to the posterior 



margin. The eyes are large and round, composite 



in structure, and placed close to the lateral margins. 



The basal article of the first pair of antennae is short 



and not dilated; the first, second, and third articles 



are about equal in length; the fourth is nearly twice 



as long as the third. The first antennae extend to the end of the third 



article of the peduncle of the second antennae. The basal article of the 

 second pair of antennae is almost inconspicuous; the 

 second is short; the third and fourth are increasingly 

 longer than the second; the fifth is about one and a 

 half times longer than the fourth. The flagellum 

 consists of eight articles. When retracted the second 

 antennae extend to the middle of the third thoracic 

 segment. 



The second, third, and fourth segments of the thorax 

 are longer than the others. The epimera of all the 

 segments are firmly united with the segments. The 

 lateral portions of the segments are expanded and the 

 lateral margins rounded in outline. Three longitud- 

 inal rows of low tubercles extend the entire length 



of the thorax, one median row and one on either side of this. On 



each segment these tubercles are situated in a transverse row of three. 

 The abdomen is composed of one segment, with lateral sutures at the 



base, indicating another partly coalesced segment. There are two very 



FIG. 420. SYNIDOTEA 

 CONSOLIDATA (AFTER 

 BENEDICT), x 6. 



FIG. 421. SYNIDOTEA 

 CONSOLIDATA. MAX- 

 ILLIPED. X 39. 



