Molluscoida at Laguna Beach 



KNTOPROCTAN HRVDZOANS 



Myusiinui s/'iiio.ui Robertson. These were oluaineil in ccinsiilcralile numbers trmn 

 the surfaces of wavy top shells, Astraea undosa W'ooil. These shells were dreilgecl 

 in from ten to fifteen fathoms of water just off shore. 



Barnilsiii i/itui/is Illncks. These were dctermineil for us by Dr. Roliertson. 

 Specimens have been collected every summer for the last few years. They occur 

 under stones at low tide. They have also been found in abundance on the under sides 

 of the worm cases of Sabellaria californica and under rock ledges. In spile of their 

 small size these little "bobbing heads" are <iuite evident in extensive areas. 



FRESH WATER HRVOZOANS NEAR LACUNA 



During the summer of 1915 a number of specimens of fresh water bryo/oans were 

 collected on submerged leaves in the medium-si/ed lake, six miles inland from 

 Laguna Beach. In the summer of 1917 no bryozoans were found in this lake, but 

 some were found at the south end of the more northern lake and at the east end of 

 the largest lake. Some of these were delermlned by Dr. Robertson as I'hi miilrllii 

 reprns L. 



ECrOPROCTAN HRVOZOA 



The following have been determined from the papers of Robertson: 

 NON-INCRUSTING FORMS 

 Aeteid.'k 



Arlrii uni/iihiii l.iiui. Finuul on brown algae. 

 KVCR.\TUD.'F. 



Eucrateii ilulalii I.iiui. Found on a dredged decorator crab. 

 Cellul.vrid.t: 



Menipea ncc'identalis Trask. 



M.n. ((Unlinensis Rob. From kelp holdfasts. Some on decorator crab. 



Scruporrllnrin < n/ifonilifi Trask. 



S. -z'tiritifis Uincks. Kelp holdfasts. 



S. liir'j I'ltsis Rob. Indei' rocks, low tide. 

 BiCELLARIID.T 



liugiila ncritina Linn. Common inider rocks. Also on piles at Balboa Bay. 



Buffiila Sp. Apparently not given by Robertson. 

 Celi.ariid.'E 



Cellaria maiuli/nilata Uincks. .Abundant along shore. 

 VeSICUI-ARIID^ 



.Imathin dhlwloma V'er. Masses of what appeared to be this species occurred 

 under rocks at .Laguna and also on the piles at Balboa Bay. This oftfn 

 swarms with many small pycnogonids. 



INC'RUSTINC BRVOZOA 



Memorami'orid.i-. 



Mcinlinmipnia Ir/iiirli/ia d'Orbigny. .Abundaiu on sea w eeils, often large masses. 

 M. inrmhranarra Linn. On large flat alga;. 

 Alvmhrtiuipnra sp. ? 



