Notes on Pacific Coast Pycnogonids 
W. A. HILTON 
The specimens reported on at this time were obtained at Laguna Beach in the 
summer of 1920. Their collection was more or less incidental to other littoral explora- 
tions. There is also included a list of forms obtained at other times and at other 
places, chiefly during the same summer at Pacific Grove. 
Pallene californiensis, Hall. 
Two of these were collected at Laguna Beach. 
Lecythorhynchus marginatus, Cole. 
Twelve specimens collected at Laguna Beach from among mussels, under rocks, 
among algae, etc. One specimen was dredged of San Diego in 1916. Thirty-four were 
collected on the land side of Catalina Island at the Isthmus in quite a different type of 
locality from that which is usual. At this place there were few red Algae but 
masses of a rather fine brown rock-weed. On these plants, hydroids and bryozoans 
were quite abundant. Many more might have been collected if there had been time. 
Among Algae in front of the Hopkins Laboratory at Pacific Grove 18 specimens 
of this species were found. One was collected at the “Big Tide Pool.” 
Ammothella tuberculata, Cole. 
Twenty specimens found in front of the Hopkins Laboratory at Pacific Grove. 
One found at low tide in the “Big Tide Pool.” None found at Laguna this season. 
A. bi-unguiculata, Dohrn, var. californica, Hall. 
Twelve of these obtained at Laguna Beach undér stones. Three specimens at the 
Isthmus, Catalina Island. 
A. spinosissima, Hall. 
Seven specimens collected at Laguna Beach. Two obtained at Pacific Grove in 
front of the laboratory. 
Tanystylum intermedium, Cole. 
Twenty-five specimens from Laguna Beach. 
Clotenia occidentalis, Cole. 
Ten specimens from Laguna Beach. Sixtey-three specimens from in front of the 
Hopkins marine station, some were found on plume hydroids and among Algae. 
Halosoma viridintestinalis, Cole. 
We usually find a number of this species at Laguna Beach but none were found 
this season. At Pacific Grove 68 were collected from masses of fine bryozoans from 
floating timbers. 
Amoplodactylus erectus, Cole. 
Specimens of this species may be obtained at Balboa among tubularian hydroids, 
a hundred or more were collected from this locality this year and one from Anaheim 
Landing with palm hydroids. 
A. californicus, Hall. 
Three specimens from Laguna Beach, 6 specimens from the Isthmus, Catalina 
Island, 1 specimen in front of the laboratory, Pacific Grove. 
Pycnogonum stearnsi, Ives. 
Seven specimens from Laguna Beach, 1 specimen from Pacific Grove. 
(Contribution from the Zoological Laboratory of Pomona College) 
